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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 installed it with wubi. I'm hoping I can just do this straight from the OS, but I understand I may have to do it from the BIOS. I have read something like

Boot from the CD and use gparts

That doesn't mean anything to me, so if that's what I need to do, please explain how to do that specifically.

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From your filesystem structure it seems like you've installed Ubuntu as a guest OS on your Windows using Wubi. When you installed it you specified 17G as the size of the virtual disk that Ubuntu can use - This is your /dev/loop0.
The /dev/sda2 is the disk of your Windows partition and therefore can not be resized to move space from it to the Ubuntu partition.

However, there is still a way to resize the virtual disk size of Wubi and is described in the WubiGuide which references to a simple script the you can download and execute. Detailed instructions are inside that guide.

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