Originally Posted by Fantasio
use partition magic, fips to resize your partition.
Partition Magic is commercial software and it costs money. While it works, there is no need to resort to its use. Fips is free software, but it is not catered to the beginner, it is a classic console command tool that was available long before easier tools became freely available other than the commercial tools.
With an existing partition containing free space, all you have to do is run the installation program and instead of using the guided approach, select the partition yourself.
contains a discussion of the installation and the partitioning particulars. There is a note at https://help.ubuntu.com/8.04/install...tallation.html
that says "If you do not want to autopartition, choose Manual from the menu." In your case, you have a 25 GB partition that is already to use, so I recommend that you choose "Manual" and select this partition on which to put your Ubuntu installation.
Try it out. The choices really are not that difficult at all, but understanding what they mean
can be a challenging experience for someone unfamiliar with disk partitioning and installation. Hopefully these comments and the documentation will help you out. Read it over a few times, and ask any questions you may have so you are comfortable.
Alternatively, just back up your existing system (which you really should do anyway) and plunge in. Sometimes making a few mistakes and trying things out will help you really understand how it all works. Remember, we are here to help!