I was having the same issue. I discovered the issue when I found errors
written to `/var/log/seat0-greeter.log`:
Error writing X authority: Failed to open X authority
/var/lib/lightdm/.Xauthority: No such file or directory
Indeed, I only had `/var/lib/lightdm-data`. Running the command
mkdir /var/lib/lightdm
and rebooting fixed the issue for me.
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https://bugs.launchpad.net/bugs/1473149
Title:
Lightdm refuses to work after installing kubuntu-desktop
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