I've been using Lubuntu Netbook for quite a few days (on Asus EeePC 1015PX), but recently I encountered a problem. I could not copy files to my root partition. I looked for the files that were eating up space, found some log files of huge size and deleted them.
It worked fine for few days, but now it again shows the root partition full.
Filesystem Size Used Avail Use% Mounted on /dev/sda6 22G 22G 0 100% / udev 489M 39M 451M 8% /dev tmpfs 199M 904K 198M 1% /run none 5.0M 0 5.0M 0% /run/lock none 496M 104K 496M 1% /run/shm
sudo du -hcs $(ls) 2> /dev/null:
8.5M bin 27M boot 4.0K cdrom 39M dev 18M etc 149M home 0 initrd.img 180M lib 16K lost+found 4.0K media 4.0K mnt 4.0K opt 2.3M root 1008K run 8.8M sbin 4.0K selinux 4.0K srv 0 sys 60K tmp 4.2G usr 399M var 0 vmlinuz 5.1G total