Public bug reported:
When switching the displaymanager from sddm to lightdm, login fails due
to misconfigured lightdm configuration file.
$ cat /usr/share/lightdm/lightdm.conf.d/40-kde-plasma-kf5.conf
[SeatDefaults]
user-session=kde-plasma-kf5
$ls /usr/share/xsessions/*
/usr/share/xsessions/plasma.desktop
#####
Changing /usr/share/lightdm/lightdm.conf.d/40-kde-plasma-kf5.conf to
$ cat /usr/share/lightdm/lightdm.conf.d/40-kde-plasma-kf5.conf
[SeatDefaults]
user-session=plasma
or renaming /usr/share/xsessions/plasma.desktop to /usr/share/xsessions
/kde-plasma-kf5.desktop solves the issue.
#####
$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
$ apt-cache policy plasma-workspace
plasma-workspace:
Installed: 4:5.5.5.2-0ubuntu1
Candidate: 4:5.5.5.2-0ubuntu1
Version table:
*** 4:5.5.5.2-0ubuntu1 500
500 http://de.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
100 /var/lib/dpkg/status
#####
** Affects: plasma-workspace (Ubuntu)
Importance: Undecided
Status: New
** Tags: kde lightdm plasma sddm
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https://bugs.launchpad.net/bugs/1629543
Title:
KDE does not start when using lightdm
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