wrong disk usage report on /

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http://askubuntu.com – I asked this on stackoverflow, but maybe here is a better place. On my ubuntu 11.10, /dev/sda3 (150GB) is mounted on / and /dev/sda1 (80GB) is mounted on /home. My entire disk has 250GB and the system is reporting I am running out of disk space. Here is the output of df -h: Filesystem Size Used Avail Use% Mounted on /dev/sda3 149G 141G 0 100% / udev 3.9G 4.0K 3.9G 1% /dev tmpfs 1.6G 860K 1.6G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.9G 508K 3.9G 1% /run/shm /dev/sda1 (HowTos)