Comment 55 for bug 365881

I was also getting the "Exception" error dialog and I had to click Cancel twice before Wubi appeared.

After reading some of the above comments, I went to Disk Management and unassigned the drive letter from my card reader. When I tried Wubi again there were no errors.

This really needs fixing as Wubi is meant to be an easy way for people to try Ubuntu and scary dialogs are likely to make a lot of people give up right there.