[Bug 1629543] [NEW] KDE does not start when using lightdm

[Thomas Gebert]

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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