If the root directory is tight and
apt-upgrade
is giving you:
E: You don't have enough free space in /var/cache/apt/archives/
then you can move apt's cache somewhere else:
mv /var/cache/apt/ /home
ln -s /home/apt/ /var/cache/apt
later undo with:
rm /var/cache/apt
mv /home/apt /var/cache
--------------------------------------------------------
various housekeeping things
apt clean
apt autoremove
journalctl --rotate
journalctl --vacuum-time=1s
remove old logs
find /var/log -mtime +2 -type f -delete
rm /var/cache/locate/locatedb
-------------------------------------------------------
other things that may help actually squeeze the root filesystem
find all the files larger than 50M on the / partition (ignoring sub-mounts!)
find / -mount -type f -size +50M -exec du -h {} \; | sort -n
find installed packages in size order
dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n", $2/(1024), $1}'
