Why does Google Music Manager refuse to open in 12.04?
Solution 1:
- Quit google-musicmanager.
- Delete the directory
~/.config/google-musicmanager. - Start google-musicmanager again. You'll get an initial setup wizard again - this time, choose an empty directory to upload music. Then the bug will not be there anymore.
I found this workaround on ubuntuforums.org.