Well, no one is stepping in so I might get this rolling by recommending something:
Use the Ubuntu CD and boot to it and then do the necessary changes during its setup because from what I have seen with other Linux distros, the partitioning utility that comes with Linux is a lot more powerful than the one included with XP. I doubt you could even modify the Linux partitions by booting up to the XP CD.
Another alternative would be to use a 'powerful enough' 3rd party Paritioning tool that works on both OSes.
Sorry, I can't give step-by-step instructions because I do not know Ubuntu at all but take a look at this link, I believe it provides adequate info.
Here is another link with other links to many more site with related info that could help you.
A personal comment from me, when using a dual boot scenario with Windows 2K or XP and a Linux Distro, I highly recommend configuring the Windows so that it dumps 'pagefile' on every shutdown (see screenshot that shows an easy way of settings this by means of XP-AntiSpy freeware.
~TL
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