Add more disk space to partition (11.10)

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http://askubuntu.com – Ubuntu is complaining that it's running out of space, and indeed, df yields: Filesystem Size Used Avail Use% Mounted on /dev/loop0 17G 15G 462M 98% / /dev/sda2 385G 18G 368G 5% /host So apparently I only have 17 gigs available on my ubuntu installation. When I run gparted, I see a /dev/sda2 and a /dev/sda1 both well over 100G. My computer should have something like 600G available. Is there any way I can add more disk space to /dev/loop0, whatever that is? Please explain to me as if I were a child. I also don't have an ubuntu CD .. I installe (HowTos)