Public bug reported:

Shutdown from Gnome and `sudo shutdown -h now` stopped working in Ubuntu 
20.04.4 LTS.
I have xserver-xorg-video-nvidia-510 installed.

journalctl bottom shows
```
march 09 15:45:13 myhost systemd[1]: basic.target: Found ordering cycle on 
nvidia-persistenced.service/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
systemd-backlight@backlight:nvidia_0.service/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
sysinit.target/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
acpid.path/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
paths.target/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
basic.target/stop
march 09 15:45:13 myhost systemd[1]: basic.target: Job 
nvidia-persistenced.service/stop deleted to break ordering cycle starting with 
basic.target/stop
march 09 15:45:13 myhost systemd[1]: Requested transaction contradicts existing 
jobs: Transaction for poweroff.target/start is destructive 
(nvidia-suspend.service has 'start' job queued, but 'stop>
march 09 15:45:13 myhost systemd-initctl[201461]: Failed to change runlevel: 
Transaction for poweroff.target/start is destructive (nvidia-suspend.service 
has 'start' job queued, but 'stop' is incl>
```

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1964352

Title:
  ordering cycle on nvidia-persistenced.service/stop - unable to
  shutdown

Status in xorg package in Ubuntu:
  New

Bug description:
  Shutdown from Gnome and `sudo shutdown -h now` stopped working in Ubuntu 
20.04.4 LTS.
  I have xserver-xorg-video-nvidia-510 installed.

  journalctl bottom shows
  ```
  march 09 15:45:13 myhost systemd[1]: basic.target: Found ordering cycle on 
nvidia-persistenced.service/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
systemd-backlight@backlight:nvidia_0.service/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
sysinit.target/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
acpid.path/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
paths.target/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Found dependency on 
basic.target/stop
  march 09 15:45:13 myhost systemd[1]: basic.target: Job 
nvidia-persistenced.service/stop deleted to break ordering cycle starting with 
basic.target/stop
  march 09 15:45:13 myhost systemd[1]: Requested transaction contradicts 
existing jobs: Transaction for poweroff.target/start is destructive 
(nvidia-suspend.service has 'start' job queued, but 'stop>
  march 09 15:45:13 myhost systemd-initctl[201461]: Failed to change runlevel: 
Transaction for poweroff.target/start is destructive (nvidia-suspend.service 
has 'start' job queued, but 'stop' is incl>
  ```

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