I can get some space back by doing apt-get autoclean.
I can get more back by apt-get clean.
This deletes lots and lots of files from my system. Judging from du's
output, /var/cache/apt/ takes a bit more than a third of my disk space.
Now I've been keeping these files around, just in case.
But do I actually need any of these files? Or are they only needed while
I'm actually busy installing stuff? After those packages have been
installed, are the corresponding files in the cache good for anything at
all? Perhaps for deleting the packages later?
(By the way, I use aptitude)
-- hendrik