Freeing Disk Space
If you think you are running near the end of your disk space, this information may help you.
Firstly confirm what devices you have, whether they are mounted or not. Run (as root or sudo)
Then see which of those are mounted and what space is available on them by typing in a console
or in X Windows, run the program kdf.
If you feel that you need to free up some space, here are a few tips and tricks.
Command line tools to see which package are using the most disk space:
aptitude -F '%I %p' search '~i'|egrep '^[0-9]+[\.,]?[0-9]*[MG]B'|sort -n
Tools to erase
files you do not want
packages you do not want
Tools to alter files to reduce them
Reduce data creation
Use the following line as your /etc/rsyslog.conf configuration file in order to not save logs but output them on virtual terminal 12:
On systems that have been running for some time you might consider stripping out old log files.
Note that localepurge is a package that will strip unwanted language versions from everything you install. If you want a new language in the future you will have to add the locale and then re-install the package.
You might consider running dpkg -l periodically and manually going through it to see if there are packages which you never use. Alternately you can install the package popularity-contest and run popularity-contest | sort > popcon This will list the packages in least-used order in a text file called ~/popcon. Then to actually remove some unwanted/unused package you can do aptitude purge -s <unwanted package> to simulate the process and see what else is affected. You can answer yes to seemingly drastic removals because the -s makes it simulate and report, not actually execute. Once you are happy with the consequences do aptitude purge <unused package> and aptitude will still tell you what it's doing and what dependencies are affected, but when you say Yes, it will actually execute the removal.
Using a compressed filesystem can save a lot of space. Typically squashfs reduces space used by about 50%, but it is read-only.
ToDo - Check media compressions.