I'm aware of the this question and these are similar issues:
But I couldn't figure it out entirely.
What I did before the error:
I accessed the tmp folder with Nautilus (sudo rights) and changed the permissions so that possibly every process is allowed to write here (that was probably very stupid).
Error analysis:
As some posts suggest in the thread I did df -h:
/dev/sda6 size: 7.4G Used: 7.1G Avail: 0 Use%: 100% Mounted on /
However, running rm ~/.xsession-errors and
mkdir ~/.xsession-errors (as suggested) did not do anything (multiple reboots inbetween). How can I check which file is so big to flood /dev/sda6 (I have a hard time to cd there) and how may I get rid of it?
I'm not an advanced user so please bear with me if I used wrong vocabulary or cannot see an obvious solution.