Ok, I have executed the above described commands from a console (logged out from graphical front end). But it didn't change anything. Instead I realized that packages were broken, when I wanted to install another theme via synaptic. I tried to repair packages out of recovery mode, but nothing happened at all. Than I tried to reinstall all my packages from a terminal:
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dpkg --get-selections | grep "\binstall" | awk '{print $1}' > /tmp/dpkg.log
sudo xargs -n1 apt-get --reinstall install -y < /tmp/dpkg.log
When I came back to my computer, it had stopped the process with an error message.
I did quite some ubuntu installations over the last five years and never had any problem with it before. This LinuxMint installation was absolutely fresh. I didn't do any configuring at all apart from installing a new theme and playing around with my desktop appearance. So I hope to get rid of the problems by installing the system from scratch again. If it doesn't work I'll have to look for another distribution and kde, what I wouldn't like to do at all.