Lubuntu Netbook shows root partition full

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http://askubuntu.com – 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. Output of df -h: 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 49 (HowTos)