I doubt it was wubi sense it would have installed the plain ubuntu......if it worked.You can Do what I did.Install the new 9.04,and download the ultimate 2.1 theme.Works good,stable,faster,and no upgrade errors.
Then you add the apps you want in a variety ways......with no errors.Least I haven't had any yet.
One more thought.....If your running an ati card,check out their driver site.They dropped support on many cards now.If you have one of these cards it should be fine unless you do any 3d stuff on your box.