After installing Ubuntu I found the helpful WubiGuide that informed me that RAID configurations are not supported by this Wubi installation of Ubuntu. Still, the Wubi installer appears to have worked, at least initially.
My first attempt to boot to Ubuntu was successful, but then all subsequent attempts take me to grub terminal. Windows still boots without trouble.
The size of the root.disk file is 0, but it exists. I'm not sure if that's normal or if it was corrupted or what... but based on the guide I used the windows command
chkdsk /R to check my disk. It found many errors, but it didn't produce a "found.000" file that I could find.
Is it possible that running Ubuntu in this unsupported RAID1 configuration would cause data corruption problems to files available through the Windows OS? I backed up my most important files, so I could restore specific files if they are corrupt. I have no idea how to interpret the windows chkdsk log, perhaps this would give some indication about which files (if any) were damaged.