I know there are ways to get your root access back and change your password, but every time I try a new flavor of Ubuntu (installing using Wubi) my username/password is ignored.
After installing and rebooting, my Ubuntu login screen shows the username "Administrator" (my Windows account name) and no password ever works.
When I try to use Recovery Mode to change the password, the keyboard input appears to be blank.
This doesn't happen when running Ubuntu directly from a partition of its own.
Currently running Wubi from a Win7 SP1 AMD 4400+ machine.