[Bug]: x11vnc exit on LXC

[jinyu121]

Describe the Bug

I'm using stem-headless in PVE 9.1, which can run OCI images using its LXC CT.c

After booting, the log shows x11vnc into a start-exit loop.

Steps to Reproduce

1. Get LXC image in PVE: skopeo copy docker:docker.io/josh5/steam-headless:latest oci-archive:/var/lib/vz/template/cache/steam-headless-20260425.tar
2. Create a unprivileged CT
3. Make it a privileged CT:
   • You can backup and restore it.
   • You can change the config file, delete the unprivileged: 1 line
4. grant more permissions

features: fuse=1,mknod=1,mount=nfs;cifs,nesting=1
lxc.apparmor.profile: unconfined
lxc.cgroup2.devices.allow: a
lxc.cap.drop: 
lxc.mount.auto: proc:rw sys:rw
lxc.mount.entry: tmpfs dev/shm tmpfs rw,nosuid,nodev,create=dir 0 0
lxc.mount.entry: /dev/kmsg dev/kmsg none bind,optional,create=file
lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir
lxc.mount.entry: /dev/fuse dev/fuse none bind,optional,create=file
lxc.mount.entry: /dev/uinput dev/uinput none bind,optional,create=file

5. modify /etc/cont-init.d/80-configure_flatpak.sh, change mount -t proc none /proc to mountpoint -q /proc || mount -t proc none /proc
6. RUN

Expected Behavior

In previous versions, we can see the CT starts, download & install Stem.

But now, the log says x11vnc crashed.

Screenshots

This log isn't from the first boot. But I remembered that they are similar.

**** Found Intel device 'Intel Corporation Raptor Lake-P [Iris Xe Graphics] (rev 04)' ****
  - Mesa has already been installed into this container
**** No AMD device found ****
**** No NVIDIA device found ****
DONE

[ /etc/cont-init.d/70-configure_desktop.sh: executing... ]
**** Configure Desktop ****
  - Enable Desktop service.
DONE

[ /etc/cont-init.d/70-configure_xorg.sh: executing... ]
**** Generate default xorg.conf ****
  - Removing /tmp/.X11-unix/X55 before starting
  - Configure container as primary the X server
  - Enabling evdev input class on pointers, keyboards, touchpads, touch screens, etc.
DONE

[ /etc/cont-init.d/80-configure_flatpak.sh: executing... ]
**** Configure Flatpak ****
  - Flatpak configured for running inside a Docker container
DONE

[ /etc/cont-init.d/90-configure_neko.sh: executing... ]
**** Configure Neko ****
  - Disable Neko server
DONE

[ /etc/cont-init.d/90-configure_steam.sh: executing... ]
**** Configure Steam ****
  - Enable Steam auto-start script
  - Steam config already exists, skipping initialization
  - Steam library config already exists, skipping initialization
DONE

[ /etc/cont-init.d/90-configure_sunshine.sh: executing... ]
**** Configure Sunshine ****
  - Enable Sunshine server
DONE

[ /etc/cont-init.d/90-configure_vnc.sh: executing... ]
**** Configure VNC ****
  - Configure VNC service port '32036'
  - Configure pulseaudio encoded stream port '32037'
  - Enable VNC server
DONE

[ /etc/cont-init.d/95-setup_wol.sh: executing... ]
**** Configure WoL Manager ****
  - Disable WoL Manager service.

**** Starting supervisord ****
  - Logging all root services to '/var/log/supervisor/'
  - Logging all user services to '/home/default/.cache/log/'

2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/accounts-daemon.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/dbus.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/desktop.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/neko.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/polkit.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/pulseaudio.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/steam.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/sunshine.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/udev.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/vnc-audio.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/vnc.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/wol-power-manager.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/xorg.ini" during parsing
2026-04-29 00:13:08,775 INFO Included extra file "/etc/supervisor.d/xvfb.ini" during parsing
2026-04-29 00:13:08,775 INFO Set uid to user 0 succeeded
Unlinking stale socket /run/supervisor.sock
2026-04-29 00:13:09,078 INFO RPC interface 'supervisor' initialized
2026-04-29 00:13:09,078 CRIT Server 'unix_http_server' running without any HTTP authentication checking
2026-04-29 00:13:09,078 INFO supervisord started with pid 1
2026-04-29 00:13:10,080 INFO spawned: 'dbus' with pid 226
2026-04-29 00:13:10,080 INFO spawned: 'udev' with pid 227
2026-04-29 00:13:10,081 INFO spawned: 'polkit' with pid 228
2026-04-29 00:13:10,082 INFO spawned: 'accounts-daemon' with pid 229
2026-04-29 00:13:10,082 INFO spawned: 'xorg' with pid 230
2026-04-29 00:13:10,083 INFO spawned: 'audiostream' with pid 231
2026-04-29 00:13:10,085 INFO spawned: 'frontend' with pid 232
2026-04-29 00:13:10,085 INFO spawned: 'pulseaudio' with pid 235
2026-04-29 00:13:10,086 INFO spawned: 'x11vnc' with pid 237
2026-04-29 00:13:10,090 INFO spawned: 'desktop' with pid 244
2026-04-29 00:13:10,091 INFO spawned: 'sunshine' with pid 250
PULSEAUDIO: Starting pulseaudio service
2026-04-29 00:13:10,523 INFO reaped unknown pid 420 (exit status 0)
2026-04-29 00:13:10,523 INFO reaped unknown pid 422 (exit status 1)
2026-04-29 00:13:10,606 INFO reaped unknown pid 447 (exit status 1)
2026-04-29 00:13:11,119 INFO success: dbus entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,119 INFO success: udev entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,119 INFO success: polkit entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: accounts-daemon entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: xorg entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: audiostream entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: frontend entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: pulseaudio entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: x11vnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: desktop entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,120 INFO success: sunshine entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:11,633 WARN exited: x11vnc (exit status 1; not expected)
2026-04-29 00:13:12,124 INFO spawned: 'x11vnc' with pid 530
2026-04-29 00:13:13,136 INFO success: x11vnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:13,136 INFO reaped unknown pid 610 (exit status 0)
2026-04-29 00:13:13,136 INFO reaped unknown pid 612 (exit status 0)
2026-04-29 00:13:13,136 INFO reaped unknown pid 614 (exit status 0)
2026-04-29 00:13:13,136 INFO reaped unknown pid 616 (exit status 0)
2026-04-29 00:13:13,136 INFO reaped unknown pid 618 (exit status 0)
2026-04-29 00:13:13,136 INFO reaped unknown pid 620 (exit status 0)
2026-04-29 00:13:13,159 WARN exited: x11vnc (exit status 1; not expected)
2026-04-29 00:13:14,160 INFO spawned: 'x11vnc' with pid 691
2026-04-29 00:13:15,170 INFO success: x11vnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:15,194 WARN exited: x11vnc (exit status 1; not expected)
2026-04-29 00:13:16,196 INFO spawned: 'x11vnc' with pid 838
2026-04-29 00:13:16,197 INFO reaped unknown pid 766 (exit status 0)
2026-04-29 00:13:17,209 INFO success: x11vnc entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2026-04-29 00:13:17,232 WARN exited: x11vnc (exit status 1; not expected)

[EOF - dtach terminating]

Relevant Settings

arch: amd64
cmode: console
cores: 4
entrypoint: /entrypoint.sh
features: fuse=1,mknod=1,mount=nfs;cifs,nesting=1
hostname: stem
memory: 4096
net0: name=eth0,bridge=vmbr0,firewall=1,gw=192.168.1.1,gw6=fdab:abcd:abcd:abcd::1:1,host-managed=1,hwaddr=BC:BC:BC:BC:BC:BC,ip=192.168.1.123/24,ip6=fdab:abcd:abcd:abcd::1:123/64,type=veth
ostype: debian
rootfs: local-zfs:subvol-129-disk-0,size=16G
swap: 0
lxc.environment.runtime: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
lxc.environment.runtime: LANG=en_US.UTF-8
lxc.environment.runtime: LANGUAGE=en_US:en
lxc.environment.runtime: LC_ALL=en_US.UTF-8
lxc.environment.runtime: PUID=99
lxc.environment.runtime: PGID=100
lxc.environment.runtime: UMASK=000
lxc.environment.runtime: USER=default
lxc.environment.runtime: USER_PASSWORD=password
lxc.environment.runtime: USER_HOME=/home/default
lxc.environment.runtime: TZ=Asis/Shanghai
lxc.environment.runtime: USER_LOCALES=en_US.UTF-8 UTF-8
lxc.environment.runtime: XORG_SOCKET_DIR=/tmp/.X11-unix
lxc.environment.runtime: XDG_RUNTIME_DIR=/tmp/.X11-unix/run
lxc.environment.runtime: XDG_SESSION_TYPE=x11
lxc.environment.runtime: FORCE_X11_DUMMY_CONFIG=false
lxc.environment.runtime: PULSE_SOCKET_DIR=/tmp/pulse
lxc.environment.runtime: PULSE_SERVER=unix:/tmp/pulse/pulse-socket
lxc.environment.runtime: XDG_DATA_DIRS=/home/default/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/
lxc.environment.runtime: DISPLAY_CDEPTH=24
lxc.environment.runtime: DISPLAY_REFRESH=120
lxc.environment.runtime: DISPLAY_SIZEH=900
lxc.environment.runtime: DISPLAY_SIZEW=1600
lxc.environment.runtime: DISPLAY_VIDEO_PORT=DFP
lxc.environment.runtime: DISPLAY=:55
lxc.environment.runtime: NVIDIA_DRIVER_CAPABILITIES=all
lxc.environment.runtime: NVIDIA_VISIBLE_DEVICES=all
lxc.environment.runtime: MODE=primary
lxc.environment.runtime: WEB_UI_MODE=vnc
lxc.environment.runtime: ENABLE_VNC_AUDIO=true
lxc.environment.runtime: NEKO_PASSWORD=neko
lxc.environment.runtime: NEKO_PASSWORD_ADMIN=admin
lxc.environment.runtime: ENABLE_STEAM=true
lxc.environment.runtime: STEAM_ARGS=-silent
lxc.environment.runtime: WEBUI_USER=
lxc.environment.runtime: WEBUI_PASS=
lxc.environment.runtime: ENABLE_SUNSHINE=true
lxc.environment.runtime: ENABLE_EVDEV_INPUTS=true
lxc.environment.runtime: ENABLE_WOL_POWER_MANAGER=false
lxc.environment.runtime: ENABLE_SID=false
lxc.environment.runtime: PORT_NOVNC_WEB=8083
lxc.environment.runtime: NEKO_NAT1TO1=
lxc.signal.halt: SIGTERM
lxc.apparmor.profile: unconfined
lxc.cgroup2.devices.allow: a
lxc.cap.drop: 
lxc.mount.auto: proc:rw sys:rw
lxc.mount.entry: tmpfs dev/shm tmpfs rw,nosuid,nodev,create=dir 0 0
lxc.mount.entry: /dev/kmsg dev/kmsg none bind,optional,create=file
lxc.mount.entry: /dev/dri dev/dri none bind,optional,create=dir
lxc.mount.entry: /dev/fuse dev/fuse none bind,optional,create=file
lxc.mount.entry: /dev/uinput dev/uinput none bind,optional,create=file

Version

ef6b5d65c5f16762202927483bc4c273a5a62172557281a836a50706c79cb234

Platform

Distribution: Debian
Linux Kernel: 6.17.13-2-pve unknown unknown GNU/Linux
GPU Driver versions: NVIDIA-SMI 580.142 Driver Version: 580.142 CUDA Version: 13.0
Docker: N/A
Docker-compose: N/A

Relevant log output

/var/log/Xorg.55.log

[462908.039] _XSERVTransmkdir: Mode of /tmp/.X11-unix should be set to 1777
[462908.040] 
X.Org X Server 1.21.1.16
X Protocol Version 11, Revision 0
[462908.040] Current Operating System: Linux stem 6.17.13-2-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.13-2 (2026-03-13T08:06Z) x86_64
[462908.040] Kernel command line: BOOT_IMAGE=/vmlinuz-6.17.13-2-pve root=ZFS=/ROOT/pve-1 ro root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet
[462908.040] xorg-server 2:21.1.16-1.3+deb13u1 (https://www.debian.org/support) 
[462908.040] Current version of pixman: 0.44.0
[462908.040]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[462908.040] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[462908.040] (==) Log file: "/var/log/Xorg.55.log", Time: Wed Apr 29 00:50:56 2026
[462908.040] (==) Using config directory: "/etc/X11/xorg.conf.d"
[462908.040] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[462908.040] (==) No Layout section.  Using the first Screen section.
[462908.040] (==) No screen section available. Using defaults.
[462908.040] (**) |-->Screen "Default Screen Section" (0)
[462908.040] (**) |   |-->Monitor "<default monitor>"
[462908.040] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[462908.040] (**) Allowing byte-swapped clients
[462908.040] (==) Automatically adding devices
[462908.040] (==) Automatically enabling devices
[462908.040] (==) Automatically adding GPU devices
[462908.040] (==) Automatically binding GPU devices
[462908.040] (==) Max clients allowed: 256, resource mask: 0x1fffff
[462908.040] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[462908.040]    Entry deleted from font path.
[462908.040] (==) FontPath set to:
        /usr/share/fonts/X11/misc,
        /usr/share/fonts/X11/100dpi/:unscaled,
        /usr/share/fonts/X11/75dpi/:unscaled,
        /usr/share/fonts/X11/Type1,
        /usr/share/fonts/X11/100dpi,
        /usr/share/fonts/X11/75dpi,
        built-ins
[462908.040] (==) ModulePath set to "/usr/lib/xorg/modules"
[462908.040] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[462908.040] (II) Loader magic: 0x5ad847faaf00
[462908.040] (II) Module ABI versions:
[462908.040]    X.Org ANSI C Emulation: 0.4
[462908.040]    X.Org Video Driver: 25.2
[462908.040]    X.Org XInput driver : 24.4
[462908.040]    X.Org Server Extension : 10.0
[462908.043] (EE) dbus-core: error connecting to system bus: org.freedesktop.DBus.Error.NoReply (Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)
[462908.044] (II) xfree86: Adding drm device (/dev/dri/card0)
[462908.044] (II) Platform probe for /sys/devices/pci0000:00/0000:00:02.0/drm/card0
[462908.059] (II) xfree86: Adding drm device (/dev/dri/card1)
[462908.059] (II) Platform probe for /sys/devices/pci0000:00/0000:00:07.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/drm/card1
[462908.061] (--) PCI:*(0@0:2:0) 8086:a7a0:8086:3037 rev 4, Mem @ 0x6123000000/16777216, 0x4000000000/268435456, I/O @ 0x00003000/64, BIOS @ 0x????????/131072
[462908.061] (--) PCI: (4@0:0:0) 10de:1b02:10de:11df rev 161, Mem @ 0x78000000/16777216, 0x6100000000/268435456, 0x6110000000/33554432, I/O @ 0x00004000/128, BIOS @ 0x????????/524288
[462908.061] (II) LoadModule: "glx"
[462908.061] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[462908.062] (II) Module glx: vendor="X.Org Foundation"
[462908.062]    compiled for 1.21.1.16, module version = 1.0.0
[462908.062]    ABI class: X.Org Server Extension, version 10.0
[462908.062] (==) Matched modesetting as autoconfigured driver 0
[462908.062] (==) Matched fbdev as autoconfigured driver 1
[462908.062] (==) Matched vesa as autoconfigured driver 2
[462908.062] (==) Assigned the driver to the xf86ConfigLayout
[462908.062] (II) LoadModule: "modesetting"
[462908.062] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[462908.062] (II) Module modesetting: vendor="X.Org Foundation"
[462908.062]    compiled for 1.21.1.16, module version = 1.21.1
[462908.062]    Module class: X.Org Video Driver
[462908.062]    ABI class: X.Org Video Driver, version 25.2
[462908.062] (II) LoadModule: "fbdev"
[462908.062] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[462908.062] (II) Module fbdev: vendor="X.Org Foundation"
[462908.062]    compiled for 1.21.1.3, module version = 0.5.0
[462908.062]    Module class: X.Org Video Driver
[462908.062]    ABI class: X.Org Video Driver, version 25.2
[462908.062] (II) LoadModule: "vesa"
[462908.062] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[462908.062] (II) Module vesa: vendor="X.Org Foundation"
[462908.062]    compiled for 1.21.1.15, module version = 2.6.0
[462908.062]    Module class: X.Org Video Driver
[462908.062]    ABI class: X.Org Video Driver, version 25.2
[462908.062] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[462908.062] (II) FBDEV: driver for framebuffer: fbdev
[462908.062] (II) VESA: driver for VESA chipsets: vesa
[462908.062] xf86EnableIO: failed to enable I/O ports 0000-03ff (Operation not permitted)
[462908.075] (II) modeset(0): using drv /dev/dri/card0
[462908.075] (WW) Falling back to old probe method for fbdev
[462908.075] (II) Loading sub module "fbdevhw"
[462908.075] (II) LoadModule: "fbdevhw"
[462908.075] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[462908.075] (II) Module fbdevhw: vendor="X.Org Foundation"
[462908.075]    compiled for 1.21.1.16, module version = 0.0.2
[462908.075]    ABI class: X.Org Video Driver, version 25.2
[462908.075] (EE) open /dev/fb0: No such file or directory
[462908.075] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[462908.075] (II) modeset(0): Creating default Display subsection in Screen section
        "Default Screen Section" for depth/fbbpp 24/32
[462908.075] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
[462908.075] (==) modeset(0): RGB weight 888
[462908.075] (==) modeset(0): Default visual is TrueColor
[462908.075] (II) Loading sub module "glamoregl"
[462908.075] (II) LoadModule: "glamoregl"
[462908.075] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[462908.077] (II) Module glamoregl: vendor="X.Org Foundation"
[462908.077]    compiled for 1.21.1.16, module version = 1.0.1
[462908.077]    ABI class: X.Org ANSI C Emulation, version 0.4
[462908.101] (II) modeset(0): glamor X acceleration enabled on Mesa Intel(R) Iris(R) Xe Graphics (RPL-P)
[462908.101] (II) modeset(0): glamor initialized
[462908.101] (==) modeset(0): VariableRefresh: disabled
[462908.101] (==) modeset(0): AsyncFlipSecondaries: disabled
[462908.129] (II) modeset(0): Output HDMI-1 has no monitor section
[462908.134] (II) modeset(0): Output HDMI-2 has no monitor section
[462908.134] (II) modeset(0): Output DP-1 has no monitor section
[462908.134] (II) modeset(0): Output DP-2 has no monitor section
[462908.135] (II) modeset(0): Output DP-3 has no monitor section
[462908.135] (II) modeset(0): Output DP-4 has no monitor section
[462908.163] (II) modeset(0): EDID for output HDMI-1
[462908.163] (II) modeset(0): Manufacturer: UGR  Model: ffff  Serial#: 538968592
[462908.163] (II) modeset(0): Year: 2016  Week: 28
[462908.163] (II) modeset(0): EDID Version: 1.3
[462908.163] (II) modeset(0): Digital Display Input
[462908.163] (II) modeset(0): Max Image Size [cm]: horiz.: 62  vert.: 34
[462908.163] (II) modeset(0): Gamma: 2.20
[462908.163] (II) modeset(0): DPMS capabilities: StandBy Suspend Off
[462908.163] (II) modeset(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4 
[462908.163] (II) modeset(0): First detailed timing is preferred mode
[462908.163] (II) modeset(0): redX: 0.633 redY: 0.340   greenX: 0.311 greenY: 0.633
[462908.163] (II) modeset(0): blueX: 0.158 blueY: 0.061   whiteX: 0.313 whiteY: 0.329
[462908.163] (II) modeset(0): Supported established timings:
[462908.163] (II) modeset(0): 720x400@70Hz
[462908.163] (II) modeset(0): 640x480@60Hz
[462908.163] (II) modeset(0): 640x480@75Hz
[462908.163] (II) modeset(0): 800x600@60Hz
[462908.163] (II) modeset(0): 800x600@75Hz
[462908.163] (II) modeset(0): 1024x768@60Hz
[462908.163] (II) modeset(0): 1024x768@75Hz
[462908.163] (II) modeset(0): 1280x1024@75Hz
[462908.163] (II) modeset(0): Manufacturer's mask: 0
[462908.163] (II) modeset(0): Supported standard timings:
[462908.163] (II) modeset(0): #0: hsize: 1920  vsize 1080  refresh: 60  vid: 49361
[462908.163] (II) modeset(0): #1: hsize: 1600  vsize 1200  refresh: 60  vid: 16553
[462908.163] (II) modeset(0): #2: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
[462908.163] (II) modeset(0): #3: hsize: 1280  vsize 800  refresh: 60  vid: 129
[462908.163] (II) modeset(0): #4: hsize: 1152  vsize 864  refresh: 75  vid: 20337
[462908.163] (II) modeset(0): Supported detailed timing:
[462908.163] (II) modeset(0): clock: 148.5 MHz   Image Size:  800 x 450 mm
[462908.163] (II) modeset(0): h_active: 1920  h_sync: 2008  h_sync_end 2052 h_blank_end 2200 h_border: 0
[462908.163] (II) modeset(0): v_active: 1080  v_sync: 1084  v_sync_end 1089 v_blanking: 1125 v_border: 0
[462908.163] (II) modeset(0): Supported detailed timing:
[462908.163] (II) modeset(0): clock: 74.2 MHz   Image Size:  800 x 450 mm
[462908.163] (II) modeset(0): h_active: 1280  h_sync: 1390  h_sync_end 1430 h_blank_end 1650 h_border: 0
[462908.163] (II) modeset(0): v_active: 720  v_sync: 725  v_sync_end 730 v_blanking: 750 v_border: 0
[462908.163] (II) modeset(0): Monitor name: UGREEN
[462908.163] (II) modeset(0): Ranges: V min: 29 V max: 75 Hz, H min: 31 H max: 140 kHz, PixClock max 605 MHz
[462908.163] (II) modeset(0): Supported detailed timing:
[462908.163] (II) modeset(0): clock: 120.8 MHz   Image Size:  640 x 360 mm
[462908.163] (II) modeset(0): h_active: 2560  h_sync: 2608  h_sync_end 2640 h_blank_end 2720 h_border: 0
[462908.163] (II) modeset(0): v_active: 1440  v_sync: 1443  v_sync_end 1448 v_blanking: 1481 v_border: 0
[462908.163] (II) modeset(0): Supported detailed timing:
[462908.163] (II) modeset(0): clock: 134.2 MHz   Image Size:  640 x 400 mm
[462908.163] (II) modeset(0): h_active: 2560  h_sync: 2608  h_sync_end 2640 h_blank_end 2720 h_border: 0
[462908.164] (II) modeset(0): v_active: 1600  v_sync: 1603  v_sync_end 1609 v_blanking: 1646 v_border: 0
[462908.164] (II) modeset(0): Supported detailed timing:
[462908.164] (II) modeset(0): clock: 297.0 MHz   Image Size:  480 x 270 mm
[462908.164] (II) modeset(0): h_active: 1920  h_sync: 2008  h_sync_end 2052 h_blank_end 2200 h_border: 0
[462908.164] (II) modeset(0): v_active: 1080  v_sync: 1084  v_sync_end 1089 v_blanking: 1125 v_border: 0
[462908.164] (II) modeset(0): Supported detailed timing:
[462908.164] (II) modeset(0): clock: 151.1 MHz   Image Size:  960 x 540 mm
[462908.164] (II) modeset(0): h_active: 3840  h_sync: 3888  h_sync_end 3920 h_blank_end 4000 h_border: 0
[462908.164] (II) modeset(0): v_active: 2160  v_sync: 2163  v_sync_end 2168 v_blanking: 2222 v_border: 0
[462908.164] (II) modeset(0): Number of EDID sections to follow: 1
[462908.164] (II) modeset(0): EDID (in hex):
[462908.164] (II) modeset(0):   00ffffffffffff0054f2ffff10022020
[462908.164] (II) modeset(0):   1c1a0103803e2278ea08a5a2574fa228
[462908.164] (II) modeset(0):   0f5054a54b00d1c0a94081808100714f
[462908.164] (II) modeset(0):   010101010101023a801871382d40582c
[462908.164] (II) modeset(0):   450020c23100001e011d007251d01e20
[462908.164] (II) modeset(0):   6e28550020c23100001e000000fc0055
[462908.164] (II) modeset(0):   475245454e0a202020202020000000fd
[462908.164] (II) modeset(0):   001d4b1f8c3c000a202020202020013e
[462908.164] (II) modeset(0):   02032bf44c1005040302015d5e5f2021
[462908.164] (II) modeset(0):   2223090707830100006d030c00100038
[462908.164] (II) modeset(0):   3c200060010203e30e6061352f00a0a0
[462908.164] (II) modeset(0):   a029503020350080682100001a713400
[462908.164] (II) modeset(0):   a0a0402e603020360080902100001a04
[462908.164] (II) modeset(0):   74801871382d40582c4500e00e110000
[462908.164] (II) modeset(0):   1e063b00a0f0703e8030203500c01c32
[462908.164] (II) modeset(0):   00001e00000000000000000000000059
[462908.164] (--) modeset(0): HDMI max TMDS frequency 300000KHz
[462908.164] (II) modeset(0): Printing probed modes for output HDMI-1
[462908.164] (II) modeset(0): Modeline "1920x1080"x60.0  148.50  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[462908.164] (II) modeset(0): Modeline "3840x2160"x60.0  594.00  3840 4016 4104 4400  2160 2168 2178 2250 +hsync +vsync (135.0 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x50.0  594.00  3840 4896 4984 5280  2160 2168 2178 2250 +hsync +vsync (112.5 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x59.9  593.41  3840 4016 4104 4400  2160 2168 2178 2250 +hsync +vsync (134.9 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x30.0  297.00  3840 4016 4104 4400  2160 2168 2178 2250 +hsync +vsync (67.5 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x25.0  297.00  3840 4896 4984 5280  2160 2168 2178 2250 +hsync +vsync (56.2 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x24.0  297.00  3840 5116 5204 5500  2160 2168 2178 2250 +hsync +vsync (54.0 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x30.0  296.70  3840 4016 4104 4400  2160 2168 2178 2250 +hsync +vsync (67.4 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x24.0  296.70  3840 5116 5204 5500  2160 2168 2178 2250 +hsync +vsync (53.9 kHz e)
[462908.164] (II) modeset(0): Modeline "3840x2160"x17.0  151.10  3840 3888 3920 4000  2160 2163 2168 2222 +hsync +vsync (37.8 kHz e)
[462908.164] (II) modeset(0): Modeline "2560x1600"x30.0  134.25  2560 2608 2640 2720  1600 1603 1609 1646 +hsync -vsync (49.4 kHz e)
[462908.164] (II) modeset(0): Modeline "2560x1440"x30.0  120.85  2560 2608 2640 2720  1440 1443 1448 1481 +hsync -vsync (44.4 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x120.0  297.00  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (135.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x119.9  296.70  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (134.9 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x59.9  148.35  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (67.4 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x30.0   74.25  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (33.8 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x25.0   74.25  1920 2448 2492 2640  1080 1084 1089 1125 +hsync +vsync (28.1 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x24.0   74.25  1920 2558 2602 2750  1080 1084 1089 1125 +hsync +vsync (27.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x30.0   74.18  1920 2008 2052 2200  1080 1084 1089 1125 +hsync +vsync (33.7 kHz e)
[462908.164] (II) modeset(0): Modeline "1920x1080"x24.0   74.18  1920 2558 2602 2750  1080 1084 1089 1125 +hsync +vsync (27.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1600x1200"x60.0  162.00  1600 1664 1856 2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1280x1024"x75.0  135.00  1280 1296 1440 1688  1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1280x1024"x60.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1280x800"x59.9   71.00  1280 1328 1360 1440  800 803 809 823 +hsync -vsync (49.3 kHz e)
[462908.164] (II) modeset(0): Modeline "1152x864"x75.0  108.00  1152 1216 1344 1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
[462908.164] (II) modeset(0): Modeline "1280x720"x60.0   74.25  1280 1390 1430 1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1280x720"x59.9   74.18  1280 1390 1430 1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1024x768"x75.0   78.75  1024 1040 1136 1312  768 769 772 800 +hsync +vsync (60.0 kHz e)
[462908.164] (II) modeset(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[462908.164] (II) modeset(0): Modeline "800x600"x75.0   49.50  800 816 896 1056  600 601 604 625 +hsync +vsync (46.9 kHz e)
[462908.164] (II) modeset(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
[462908.164] (II) modeset(0): Modeline "720x480"x60.0   27.03  720 736 798 858  480 489 495 525 -hsync -vsync (31.5 kHz e)
[462908.164] (II) modeset(0): Modeline "720x480"x59.9   27.00  720 736 798 858  480 489 495 525 -hsync -vsync (31.5 kHz e)
[462908.164] (II) modeset(0): Modeline "640x480"x75.0   31.50  640 656 720 840  480 481 484 500 -hsync -vsync (37.5 kHz e)
[462908.164] (II) modeset(0): Modeline "640x480"x60.0   25.20  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz e)
[462908.164] (II) modeset(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz e)
[462908.164] (II) modeset(0): Modeline "720x400"x70.1   28.32  720 738 846 900  400 412 414 449 -hsync +vsync (31.5 kHz e)
[462908.169] (II) modeset(0): EDID for output HDMI-2
[462908.169] (II) modeset(0): EDID for output DP-1
[462908.169] (II) modeset(0): EDID for output DP-2
[462908.169] (II) modeset(0): EDID for output DP-3
[462908.169] (II) modeset(0): EDID for output DP-4
[462908.169] (II) modeset(0): Output HDMI-1 connected
[462908.169] (II) modeset(0): Output HDMI-2 disconnected
[462908.170] (II) modeset(0): Output DP-1 disconnected
[462908.170] (II) modeset(0): Output DP-2 disconnected
[462908.170] (II) modeset(0): Output DP-3 disconnected
[462908.170] (II) modeset(0): Output DP-4 disconnected
[462908.170] (II) modeset(0): Using exact sizes for initial modes
[462908.170] (II) modeset(0): Output HDMI-1 using initial mode 1920x1080 +0+0
[462908.170] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
[462908.170] (==) modeset(0): DPI set to (96, 96)
[462908.170] (II) Loading sub module "fb"
[462908.170] (II) LoadModule: "fb"
[462908.170] (II) Module "fb" already built-in
[462908.170] (II) UnloadModule: "fbdev"
[462908.170] (II) Unloading fbdev
[462908.170] (II) UnloadSubModule: "fbdevhw"
[462908.170] (II) Unloading fbdevhw
[462908.170] (II) UnloadModule: "vesa"
[462908.170] (II) Unloading vesa
[462908.242] (==) modeset(0): Backing store enabled
[462908.242] (==) modeset(0): Silken mouse enabled
[462908.392] (II) modeset(0): Initializing kms color map for depth 24, 8 bpc.
[462908.392] (II) modeset(0): [DRI2] Setup complete
[462908.392] (II) modeset(0): [DRI2]   DRI driver: iris
[462908.392] (II) modeset(0): [DRI2]   VDPAU driver: va_gl
[462908.392] (II) Initializing extension Generic Event Extension
[462908.392] (II) Initializing extension SHAPE
[462908.392] (II) Initializing extension MIT-SHM
[462908.392] (II) Initializing extension XInputExtension
[462908.392] (II) Initializing extension XTEST
[462908.392] (II) Initializing extension BIG-REQUESTS
[462908.393] (II) Initializing extension SYNC
[462908.393] (II) Initializing extension XKEYBOARD
[462908.393] (II) Initializing extension XC-MISC
[462908.393] (II) Initializing extension SECURITY
[462908.393] (II) Initializing extension XFIXES
[462908.393] (II) Initializing extension RENDER
[462908.393] (II) Initializing extension RANDR
[462908.393] (II) Initializing extension COMPOSITE
[462908.393] (II) Initializing extension DAMAGE
[462908.393] (II) Initializing extension MIT-SCREEN-SAVER
[462908.393] (II) Initializing extension DOUBLE-BUFFER
[462908.393] (II) Initializing extension RECORD
[462908.393] (II) Initializing extension DPMS
[462908.393] (II) Initializing extension Present
[462908.393] (II) Initializing extension DRI3
[462908.393] (II) Initializing extension X-Resource
[462908.393] (II) Initializing extension XVideo
[462908.393] (II) Initializing extension XVideo-MotionCompensation
[462908.393] (II) Initializing extension SELinux
[462908.393] (II) SELinux: Disabled on system
[462908.393] (II) Initializing extension GLX
[462908.397] (II) AIGLX: Loaded and initialized iris
[462908.397] (II) GLX: Initialized DRI2 GL provider for screen 0
[462908.397] (II) Initializing extension XFree86-VidModeExtension
[462908.397] (II) Initializing extension XFree86-DGA
[462908.397] (II) Initializing extension XFree86-DRI
[462908.397] (II) Initializing extension DRI2
[462908.398] (II) modeset(0): Damage tracking initialized
[462908.398] (II) modeset(0): Setting screen physical size to 508 x 285
[462908.422] (II) config/udev: Adding drm device (/dev/dri/card1)
[462908.422] (II) xfree86: Adding drm device (/dev/dri/card1)
[462908.422] (II) Platform probe for /sys/devices/pci0000:00/0000:00:07.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/drm/card1
[462908.425] (EE) dbus-core: error connecting to system bus: org.freedesktop.DBus.Error.NoReply (Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)

[pullasuti]

3. Make it a **privileged** CT:
   
   * You can backup and restore it.
   * You can change the config file, delete the `unprivileged: 1` line

Possibly not.

Tried changing the config file, but ended up with remaining file permissions from unprivileged LXC (half of the system files were owned by 10000:10000 and the other half by root). Even after fixing these, and getting x11vnc and sunshine and the webui to work, the installer still wouldn't finish.

Made a clean installation and changed the LXC to privileged with pct restore and the --unprivileged 0 switch, and the container works fine from start to finish.

Nice to find your notes, thought. I would probably have spent the week trying to build a LXC container from the ground up, had I not noticed this post 😄

[jinyu121]

Hi @pullasuti , do you know how to create a privileged using cli?

Because when I want to create a privileged CT, both the web and command gets an error:

Detected OCI archive
TASK ERROR: unable to create CT 123 - setgid(0): Invalid argument

My command is:

pct create 123 local:vztmpl/steam-headless-20260530.tar \
  -cores 8 \
  -memory 8192 \
  -swap 512 \
  -unprivileged 0 \
  -rootfs local-zfs:32 \
  -net0 name=eth0,bridge=vmbr0,ip=192.168.1.123/24,gw=192.168.1.1,ip6=2001:db8::123/64,gw6=2001:db8::1 \
  -start 0

But if I remove the -unprivileged 0 line, things goes normal, and a unprivileged CT is created.