You can't install Linux on a NTFS filesystem... well, maybe you can, but it's a really bad idea. Let the ubuntu installer format it as ext3. Linux needs a linux filesystem.
Is there any data on the ntfs partition?
Are you trying to shrink it, or should ubuntu take up the whole drive?
If you just want to try it, and you don't care if it's slow and doesn't support 3d drivers and the like, you can install ubuntu in something like virtualbox or vmware (in a virtual machine running on windows). That's not so good for productive use though.
Last edited by oskar; 02-07-2008 at 03:31 AM.