this is a weird post...
some semantics i think i should clarify.
ubuntu is a distribution of linux therefore many software packages will run on most distributions of linux.
also i used norton ghost in the past (now i beleive it's semantec ghost) so please correct me if they changed something in recent versions but doesnt it start up before the os (e.g.- windows) starts up. therefore if you bought a legit copy of semantec/ norton ghost you should be able to back up your linux drive as well (i.e. norton ghost is operating system independant).
if for some reason norton ghost only works with windows fat32/ ntfs drives then my first comment about dd
still stands. boot up a live-cd/dvd/usb (preferably knoppix)and run(modified):
dd if=/dev/sd<a> bs=16K | bzip2 > hd-iso.bz2 conv=noerror
note: substitute <a>
with whatever device node is connected to your hd.