I've seen questions about this error posted all over [the internet], and figured that it might help someone to post my solution somewhere.

I recently installed the Vistar7 theme package on Kubuntu 14.04 as per the provided README. The install script creates a user called vistar7 so that you [the end user] can play around with the theme without mucking up any other user accounts KDE configurations. I got my environment setup the way that I wanted with the vistar7 user, and decided to take a shortcut and clone the the user's directory to avoid have to do the configuration all over again. I used the command:

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/home/testuser/#tar -cf - . | (cd ../testuser2;tar -xf -)
chown -R testuser2:testuser2 ../testuser2


login with the new testuser2 went OK, however, logging into the system with the previous user triggered the aforementioned error; I created and cloned the vistar7 user two more times to be sure, and each time the originating source user is the one that would break.

I did some digging around and found that in ~/.kde there is a softlink to /tmp/kde-username; the link name is tmp-`hostname`. In the source user's directory this file was owned by root:root, and had no permissions what-so-ever. I deleted the link, and recreated it (as the directory owner) with the command

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ln -s tmp-`hostname` /tmp/kde-username.


After recreating this symlink I was able to log into KDE with no issues.


Hopefully this helps someone out!

Bye!