Public bug reported:

When the nvidia driver packages are uninstalled, they leave some
symlinks that prevent suspend.

I whink that, when attempting to suspend, the error is logged as this
(edited):

    ModemManager[3287]: <warn>  [sleep-monitor] inhibit failed: 
GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected 
from message bus without replying
    upowerd[5771]: Could not acquire inhibitor lock: 
GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected 
from message bus without replying
    dbus-daemon[2888]: [system] Activating via systemd: service 
name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service' 
requested by ':1.53' (uid=1000 pid=8227 
comm="/usr/lib/x86_64-linux-gnu/indicator-session/indica" label="unconfined")
    systemd[1]: systemd-logind.service: Main process exited, code=exited, 
status=1/FAILURE
    systemd[1]: systemd-logind.service: Failed with result 'exit-code'.
    systemd[1]: systemd-logind.service: Scheduled restart job, restart counter 
is at 7.
    systemd[1]: Stopped Login Service.
    systemd[1]: Condition check resulted in Load Kernel Module drm being 
skipped.
    systemd[1]: Starting Login Service...

I've deleted the problematic symlinks while trying to solving the
problem, however, they should be these:

    /etc/systemd/system/systemd-suspend-service.requires/nvidia-suspend.service
    /etc/systemd/system/systemd-suspend-service.requires/nvidia-resume.service
    
/etc/systemd/system/systemd-hibernate-service.requires/nvidia-suspend.service
    /etc/systemd/system/systemd-hibernate-service.requires/nvidia-resume.service

I don't see any reason why they should hang around the systemd
configuration once the packages are purged. Additionally, this is a
problem that is not easy to diagnose.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: nvidia-driver-470 (not installed)
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
CurrentDesktop: MATE
Date: Mon Aug 30 21:10:52 2021
LiveMediaBuild: Ubuntu-MATE 20.04.3 LTS "Focal Fossa" - Release amd64 
(20210819.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-470
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-470 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

  When the nvidia driver packages are uninstalled, they leave some
  symlinks that prevent suspend.
  
- I've deleted them while figuring out what the problem was, however, they
- should be these:
+ I whink that, when attempting to suspend, the error is logged as this
+ (edited):
  
-     
/etc/systemd/system/systemd-suspend-service.requires/nvidia-suspend.service
-     /etc/systemd/system/systemd-suspend-service.requires/nvidia-resume.service
-     
/etc/systemd/system/systemd-hibernate-service.requires/nvidia-suspend.service
-     
/etc/systemd/system/systemd-hibernate-service.requires/nvidia-resume.service
+     ModemManager[3287]: <warn>  [sleep-monitor] inhibit failed: 
GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected 
from message bus without replying
+     upowerd[5771]: Could not acquire inhibitor lock: 
GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected 
from message bus without replying
+     dbus-daemon[2888]: [system] Activating via systemd: service 
name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service' 
requested by ':1.53' (uid=1000 pid=8227 
comm="/usr/lib/x86_64-linux-gnu/indicator-session/indica" label="unconfined")
+     systemd[1]: systemd-logind.service: Main process exited, code=exited, 
status=1/FAILURE
+     systemd[1]: systemd-logind.service: Failed with result 'exit-code'.
+     systemd[1]: systemd-logind.service: Scheduled restart job, restart 
counter is at 7.
+     systemd[1]: Stopped Login Service.
+     systemd[1]: Condition check resulted in Load Kernel Module drm being 
skipped.
+     systemd[1]: Starting Login Service...
  
- There's not reason to leave them once the driver is uninstalled, and
- it's hard to figure out the problem, so they should go away when the
- packages are uninstalled.
+ I've deleted the problematic symlinks while trying to solving the
+ problem, however, they should be these:
+ 
+     
/etc/systemd/system/systemd-suspend-service.requires/nvidia-suspend.service
+     /etc/systemd/system/systemd-suspend-service.requires/nvidia-resume.service
+     
/etc/systemd/system/systemd-hibernate-service.requires/nvidia-suspend.service
+     
/etc/systemd/system/systemd-hibernate-service.requires/nvidia-resume.service
+ 
+ I don't see any reason why they should hang around the systemd
+ configuration once the packages are purged. Additionally, this is a
+ problem that is not easy to diagnose.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: nvidia-driver-470 (not installed)
  ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-27-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CasperVersion: 1.445.1
  CurrentDesktop: MATE
  Date: Mon Aug 30 21:10:52 2021
  LiveMediaBuild: Ubuntu-MATE 20.04.3 LTS "Focal Fossa" - Release amd64 
(20210819.1)
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=C.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=C.UTF-8
+  SHELL=/bin/bash
  SourcePackage: nvidia-graphics-drivers-470
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1942133

Title:
  Nvidia driver packages prevent suspend due to leftover Systemd units

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