KDE and Kubuntu Troubleshooting Guide

Login Splash Screen Loops on Login Attempt

Your password is correct, but when you attempt to log in from the graphical splash screen login you see KDE start to load, then goes right back to the login screen.

Sometimes after mucking around as sudo you lost permissions on one or more critical file in your home directory. Try:

sudo chown username:username .Xauthority

Replace "username" with your specific username. Do this from console.

This specific problem can happen if you've been using "sudo" with X applications. Use "kdesudo" instead from within X.

If you use, for example, "sudo bash" then run an update or install, you will overwrite your home directory config files with new ones owned by root. KDE login as nonpriv user will fail to start because it cannot access the config files it needs.

Possible errors shown in /var/log/auth.log