Lightdm failed to start with Kernel 5.11.14

[screwtape]

Hi there, have a look here:

Failed to start lightdm on boot - can't log in to system!

Thanks very much for those links, that was very helpful. Ultimately I believe the problem was that lightdm was attempting to start before the graphics drivers were loaded properly. For anyone reading this thread later, the way to fix this is to insert the line logind-check-graphical=true to the [LightDM] section of the file /etc/lightdm/lightdm.conf and reboot. This forces the lightdm service to wait for graphics devices be ready before attempting to launch the greeter, which solved the issu…

Last post might be the solution.
(Edit: Changed link to correct post.)