As distributed, Portable Ubuntu has only a 2 GB root disk. If you want a larger root disk, follow this procedure:
1) Halt Linux with
2) Download the Colinux Image Tools from http://csemler.com/toporesize-0.7.1.zip. If that doesn't work, other links can be found at http://colinux.wikia.com/wiki/ColinuxImageTools. Unpack the ZIP file in any convenient directory.
3) In Windows, run
tfile ...\images\rootfs.img n
with the location of your Portable Ubuntu tree and
with the desired size in megabytes. For example, for a 32 GB disk, specify 32768. This should be very fast.
4) Restart Linux.
5) In Linux, run
. Do not do anything on Linux while this runs: it will take some time.
completes, you can see the new size of your root disk with
du -h /
In step 5, run
sudo resize2fs /dev/cobd0
Thanks man, a nice tip.