Run bleachbit and bleachbit-root to clean up your system. That will free up some space. Check /var/cache/apt/archives for any RPM packages. If present, delete them (as root).
bleachbit worked, but bleachbit-root did not work (bash: bleachbit-root: command not found)
/var/cache/apt/archives was empty.
But I found that /var/log/ had huge 'message' and 'syslog' files that apparently caused my system to crash. Also the 'message' and 'syslog' files seem to be identical in size (redundant?) -- why?
I was able to delete some of the older files and free up enough space that I was able to restart the system.
But now I need to find out why the system is creating this enormous number of error messages!
395,450 entries in /var/log/messages for two days (Sept 2nd through 3rd). I shut the system down last night about 8 pm to stop it from posting more error messages, then restarted it this morning, Sept 4. In the first 1.5 hours, it added 682 new entries to messages that I posted at this link:http://www.upquick.com/temp/messagesSep4.txt
deleting some of the message files reduced the root partition from 12G to 9.8G but that is still almost 3-times the size it should be. Here are the current 'df' results:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 12G 9.8G 1.5G 88% /
tmpfs 473M 0 473M 0% /dev/shm
/dev/sda6 168G 23G 145G 14% /home
So, how can I find out what all these error messages mean and what changes I need to make to stop this huge ongoing posting of error messages?
Also, since /var/log/messages and /var/log/syslog seem to be redundant, can I safely delete one or the other (and which)?