I ran into the same problem in 20.04 after switching to lightdm and it
took me a while to figure out.
Just as Simon pointed out:
/usr/share/lightdm/lightdm.conf.d/40-kde-plasma-kf5.conf
should have:
user-session=plasma
instead of
user-session=kde-plasma-kf5
since there is no kde-plasma-kf5.desktop in /usr/share/xsessions
I understand that most people aren't switching the display manager but
this is such an easy fix I'd hope that it's done to save a lot of
frustration for the few that do.
** Changed in: plasma-workspace (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/1629543
Title:
KDE does not start when using lightdm
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