It would be useful to find out why gdm3 works for you but lightdm does
not. It might be because gdm3 defaults to Wayland not Xorg, or it might
be a difference in the greeter/login screen itself. To find out, please
try editing /etc/gdm3/custom.conf and change:

  #WaylandEnable=false

to

  WaylandEnable=false

then reboot.

Does gdm3 still work now it's using Xorg?

** Tags added: radeon

** Summary changed:

- Failure to pass system check and present login screen
+ [radeon] Failure to pass system check and present login screen

** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

** Also affects: lightdm (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: lightdm (Ubuntu)
       Status: New => Incomplete

** Also affects: unity-greeter (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: unity-greeter (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1913855

Title:
  [radeon] Failure to pass system check and present login screen

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