another noob question in regards to this, after deleting apps, the rootfs space does not seem to be recovered, even after a reboot. i had installed mplayer (19.4M). rootfs usage was 189M used , according to diskusage

then i used this cmd

dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k2 -n

and it was shown at the bottom of the list (sorted by size)

i uninstalled it, rebooted and diskusage still showed 189M used. running the above commandline once again showed it was still there.

dpkg -L mplayer

returned that package mplayer does not contain any files?!

so, my question; how do you purge installed files sitting on rootfs?