for people that need more space
just
mv /var/cache/apt dir to /home/user/apt-cache
and then symlink it back in
ln -s /home/user/apt-cache apt

and do the same for /var/lib/apt
mv /var/lib/apt dir to /home/user/apt-lib
ln -s /home/user/apt-lib apt

that will clear op some stuff, especially if you have more repositories enabled.
Why those caches and indexes are on rootfs.. if it is just for speed?
i dont notice that, appmanager is slow anyway in everything it does (cpu wise)
and updating with apt-get is just as fast.