Repartitioning went fine. No problems at all.

The update to Ubuntu Gutsy Gibbon also went very well, with the wireless connection coming straight back up. Just a few niggles to sort out:

1 - The mozilla thunderbird icon disappeared from the quick launch tray. Easy to reinstate.

2 - The clock settings went very strange. This is due to the machine dual booting with windows and both operating systems trying to set the computer's hardware clock to British Summer Time. Resolved in Linux by unchecking the box marked 'use UTC'

3 - Flash. I've been using the flashplugin-nonfree package. The package was still installed, but flash wasn't working. Uninstalling and reinstalling this package in synaptic got flash working again, but the next reboot brought the same problem up.

In firefox, type about:plugins into the address bar to see what plugins are installed. I found three different versions of flash installed. Made note of the dates of each version and went looking for the older versions to delete them.

The file that flashplugin-nonfree gets is called libflashplayer.so. Likely places to find it are in usr/lib/firefox/plugins, myhomedir/.mozilla/plugins, usr/lib/flashplugin-nonfree

This last one was the most recent version. Deleting the other versions fixed the problem.