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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Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1473149
Title:
Lightdm refuses to work after installing kubuntu-desktop
Status in lightdm package in Ubuntu:
Triaged
Bug description:
After installing kubuntu-desktop meta package I saw a prompt telling me that
both sddm and lightdm are available and I am forced to choose one between
them.so I chose lightdm.on the next reboot I was unable to use GUI.
After 2-3 weeks,I retried using sudo dpkg-reconfigure lightdm and selected
lightdm.still fails to run GUI.
sddm works fine and is able to handle both Plasma and Unity.
Ubuntu 15.04 with lightdm 1.14.2-0ubuntu1
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lightdm 1.14.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Jul 9 21:15:22 2015
InstallationDate: Installed on 2015-06-09 (30 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
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