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This has started to happen after I encrypted my home folder (this was done after the installation, not as a part of it)... This was in 11.10.

I have since upgraded to 12.04 and after first reboot everything worked well. However since reboot after this, the messages started to pop up again before the actual KDM login prompt.

I am using Kubuntu 12.04 and I have tried different things such as permissions 777 for /tmp, removing everythign from /tmp or even deleeting ~/.kde or ~/.Xauthority etc.

Any ideas?

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I had the same issue and found that my /home/USER/.kde folder was owned by root, which was causing permissions issues. After fixing the ownership issues with 'chown', things worked as expected.

Do this in terminal:

cd ~/
sudo chown -R <user> .kde
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Good answer, @Dave, this worked for me. I have edited the answer to include the commands. – jkurtisr32 Apr 11 '14 at 15:00

I could login after renaming my ~/.kde folder. Apparently something was corrupted and renaming the folder causes creation of a clean version. You will probably loose settings but at least you can login.

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thanks. worked for me. – hamed May 18 '15 at 14:17

Logon with gnome, and try create another user, for some reason that I don't know, the config files for kde are invalid.

That worked for me.

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If you don't have GNOME or another non-KDE desktop environment, you can log in non-graphically on a virtual console (Ctrl+Alt+F1) and use adduser to create a new user account. For example, adduser --add_extra_groups USERNAME, then make sure to specify sudo as an additional group when prompted (or admin, if using an Ubuntu release prior to 12.04 LTS). However, I'm not sure if Israel Lins is saying that creating a user outside KDE works in KDE, or just saying to use GNOME instead. – Eliah Kagan Jun 16 '12 at 3:17

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