First and foremost, note that I'm a complete noob to Linux, so please bear with my confuzzled rambling.
I've recently installed Ubuntu 12.04 LTS via Wubi (18GB installation on the C: drive) on an AMD 64-bit Windows 7 system, and love it. However, I've just discovered that I'm running out of space on the disc; according to system monitor, I'm using 16.2 / 16.8 GiB on ext3 /dev/loop3 (the Ubuntu installation), while I've got more than 400 GBs left on fuseblk /dev/sda3 (/host/). I'd like to know how to re-mount Wubi from ext3 /dev/loop0 to /dev/sda3 and take advantage of the space there - I'm searching, but I have absolutely no idea how to do so.
Results of df -h:
Filesystem Size Used Avail Use% Mounted on /dev/loop0 17G 17G 551M 97% / udev 1.8G 12K 1.8G 1% /dev tmpfs 741M 868K 740M 1% /run none 5.0M 0 5.0M 0% /run/lock none 1.9G 332K 1.9G 1% /run/shm /dev/sda3 582G 166G 417G 29% /host
Results of sudo losetup -a:
/dev/loop0: :4714 (/host/ubuntu/disks/root.disk)
Help would be appreciated!