this is a PDI - install (now on 5.3.1, carried over from 3, 4.0.2, 5.0.1) and very usefull (text/web, nothing fancy) for some years

usual problem firefox/iceweasel crawling to a stop or suddenly quitting, needing a reboot.
but since restore session-option not a problem, so I lately discovered a CTRL ALT BACKSPACE to just restart knoppix which worked fine.

2 days ago, I needed a reboot though and suddenly ran into (on the splash screen, first step):

The following installation problem was detected when trying to start KDE
$HOME directory (/home/knoppix) is out of disk space
KDE is unable to start

after clicking OK (which it was not of course) I got:

Couldn't start ksmserver. Check your installation

which led to:

Not enough memory to start kde!
(At least 82 MB required
Using TWM windowmanager instead
etc

a reboot didn't solve it, the Live-CD worked fine.
then using 4.0.2 was OK, everything worked.

then I tried 5.3.1 again and that is up and running now, but because I don't know what will happen when iceweasel crawls to a stop or suddenly quits again and a restart/reboot wil be necessary I quickly searched/scanned for an answer on how to solve this (as a relative newcomer).
since I didn't find anything usefull yet, I opened this new topic.

when I look at the size of /home now, it has only 1% free (6 MB out of 484.2 MB) which is very ominous.


I hope this is enough info for some helpfull tips/solutions?

1000 thx in advance