You appear to have the 'oibaf' PPA installed which commonly causes
graphics problems, and might be the problem here too.

To remove all doubt, please uninstall that PPA using the 'ppa-purge'
tool. Then if you experience any more problems please open a new bugs
for them.

** Changed in: gdm3 (Ubuntu)
       Status: New => Invalid

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1908717

Title:
  Black screen with blinking cursor

Status in gdm3 package in Ubuntu:
  Invalid

Bug description:
  For some reason, since today GDM has ceased to work. No updates came
  through as last time I installed any updates was a week ago.

  Upon boot, gdm goes to a black screen with a cursor. This screen
  flickers to show the underlying tty and on each flicker the cursor
  position resets.

  I can start my window manager (sway) without issue from the console
  still and everything functions normally.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gdm3 3.36.3-0ubuntu0.20.04.2
  ProcVersionSignature: Ubuntu 5.4.0-53.59-generic 5.4.65
  Uname: Linux 5.4.0-53-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: sway
  Date: Fri Dec 18 13:44:09 2020
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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