Mediakit reports no such partition

I have Leopard and Ubuntu installed side by side on my MacBook. I am running out of space on Leopard and wanted to free up some space.

So I loaded the Live version of Ubuntu and made the native Ubuntu partition smaller.

I then restarted and loaded the Disk Utility from the Leopard installation CD and tried to make my Leopard partition larger, however after I click 'Apply', a message comes up saying: Mediakit reports no such partition.

Anyone know what the issue could be? Why can I not add the free space to the Leopard partition?

Thank you!

Hard to say. Could be due to differences in what Disk Utility and the app you used in Ubuntu work, or what file systems they recognize. You may be best off trying a 3rd party utility like iPartition that supports pretty much any file system and can resize nondestructively.