LightDM Mint Ubuntu Debian won't start errors Nvidia Graphics

This error implies that there may be an issue with Xorg or maybe your NVIDIA GPU cannot start or initialize:

 

35 laptop kernel: [ 2031.857704] nvidia: loading out-of-tree module taints kernel.
35 laptop kernel: [ 2031.857724] nvidia: module license 'NVIDIA' taints kernel.
35 laptop kernel: [ 2031.857725] Disabling lock debugging due to kernel taint
35 laptop kernel: [ 2031.873280] nvidia: module verification failed: signature and/or required key missing - tainting kernel
35 laptop kernel: [ 2031.889584] nvidia-nvlink: Nvlink Core is being initialized, major device number 240
35 laptop kernel: [ 2031.891260] nvidia 0000:04:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=io+mem
36 laptop kernel: [ 2032.007089] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  515.48.07  Fri May 27 03:26:43 UTC 2022
36 laptop systemd[1]: nvidia-persistenced.service: Unit not needed anymore. Stopping.
36 laptop systemd[1]: Requested transaction contradicts existing jobs: Transaction is destructive.
36 laptop systemd[1]: nvidia-persistenced.service: Failed to enqueue stop job, ignoring: Transaction is destructive.
36 laptop systemd[1]: Starting NVIDIA Persistence Daemon...
36 laptop nvidia-persistenced: Verbose syslog connection opened
36 laptop nvidia-persistenced: Now running with user ID 126 and group ID 135
36 laptop nvidia-persistenced: Started (29843)
36 laptop nvidia-persistenced: device 0000:04:00.0 - registered
36 laptop nvidia-persistenced: Local RPC services initialized
36 laptop systemd[1]: Started NVIDIA Persistence Daemon.
36 laptop systemd[1]: nvidia-persistenced.service: Unit not needed anymore. Stopping.
36 laptop nvidia-persistenced: Received signal 15
36 laptop systemd[1]: Stopping NVIDIA Persistence Daemon...
36 laptop nvidia-persistenced: Socket closed.
36 laptop nvidia-persistenced: PID file unlocked.
36 laptop nvidia-persistenced: PID file closed.
36 laptop nvidia-persistenced: The daemon no longer has permission to remove its runtime data directory /var/run/nvidia-persistenced
36 laptop nvidia-persistenced: Shutdown (29843)
36 laptop systemd[1]: Stopped NVIDIA Persistence Daemon.
36 laptop kernel: [ 2032.033697] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms  515.48.07  Fri May 27 03:18:00 UTC 2022
36 laptop kernel: [ 2032.054319] [drm] [nvidia-drm] [GPU ID 0x00000400] Loading driver
36 laptop kernel: [ 2032.054322] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:04:00.0 on minor 0
36 laptop kernel: [ 2032.063471] nvidia-uvm: Loaded the UVM driver, major device number 237.
40 laptop systemd[1]: Starting Detect the available GPUs and deal with any system changes...
40 laptop systemd[1]: Started Detect the available GPUs and deal with any system changes.
40 laptop systemd[1]: Starting Light Display Manager...
40 laptop lightdm[29935]: Seat type 'xlocal' is deprecated, use 'type=local' instead
40 laptop systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
40 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
40 laptop systemd[1]: Failed to start Light Display Manager.
40 laptop systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
40 laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 1.
40 laptop systemd[1]: Stopped Light Display Manager.
40 laptop systemd[1]: Starting Detect the available GPUs and deal with any system changes...
40 laptop systemd[1]: Started Detect the available GPUs and deal with any system changes.
40 laptop systemd[1]: Starting Light Display Manager...
40 laptop lightdm[29958]: Seat type 'xlocal' is deprecated, use 'type=local' instead
40 laptop systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
40 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
40 laptop systemd[1]: Failed to start Light Display Manager.
40 laptop systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
40 laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 2.
40 laptop systemd[1]: Stopped Light Display Manager.
40 laptop systemd[1]: Starting Detect the available GPUs and deal with any system changes...
40 laptop systemd[1]: Started Detect the available GPUs and deal with any system changes.
40 laptop systemd[1]: Starting Light Display Manager...
40 laptop lightdm[29981]: Seat type 'xlocal' is deprecated, use 'type=local' instead
40 laptop systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
40 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
40 laptop systemd[1]: Failed to start Light Display Manager.
40 laptop systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
40 laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 3.
40 laptop systemd[1]: Stopped Light Display Manager.
40 laptop systemd[1]: Starting Detect the available GPUs and deal with any system changes...
40 laptop systemd[1]: Started Detect the available GPUs and deal with any system changes.
40 laptop systemd[1]: Starting Light Display Manager...
40 laptop lightdm[30004]: Seat type 'xlocal' is deprecated, use 'type=local' instead
40 laptop systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
40 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
40 laptop systemd[1]: Failed to start Light Display Manager.
41 laptop systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
41 laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 4.
41 laptop systemd[1]: Stopped Light Display Manager.
41 laptop systemd[1]: Starting Detect the available GPUs and deal with any system changes...
41 laptop systemd[1]: Started Detect the available GPUs and deal with any system changes.
41 laptop systemd[1]: Starting Light Display Manager...
41 laptop lightdm[30028]: Seat type 'xlocal' is deprecated, use 'type=local' instead
41 laptop systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
41 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
41 laptop systemd[1]: Failed to start Light Display Manager.
41 laptop systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
41 laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 5.
41 laptop systemd[1]: Stopped Light Display Manager.
41 laptop systemd[1]: gpu-manager.service: Start request repeated too quickly.
41 laptop systemd[1]: gpu-manager.service: Failed with result 'start-limit-hit'.
41 laptop systemd[1]: Failed to start Detect the available GPUs and deal with any system changes.
41 laptop systemd[1]: lightdm.service: Start request repeated too quickly.
41 laptop systemd[1]: lightdm.service: Failed with result 'exit-code'.
41 laptop systemd[1]: Failed to start Light Display Manager.

Solution

Careful, you could have mdm as the default display manager, which is why this doesn't work.

If you are not sure the easiest way is to do this:

sudo apt remove mdm

After this, lightdm should start.


Tags:

lightdm, mint, ubuntu, debian, errors, nvidia, graphicsthis, implies, xorg, gpu, initialize, laptop, kernel, loading, module, taints, disabling, debugging, taint, verification, tainting, nvlink, initialized, vgaarb, vga, decodes, olddecodes, io, mem, nvrm, unix, _, fri, utc, systemd, persistenced, requested, transaction, contradicts, existing, destructive, enqueue, ignoring, persistence, daemon, verbose, syslog, user, registered, rpc, socket, pid, unlocked, runtime, directory, var, shutdown, modeset, mode, platforms, drm, uvm, detect, gpus, display, xlocal, deprecated, exited, scheduling, restart, repeated, mdm, default, doesn, easiest, sudo, apt,

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