umount_source shouldn't be called at all during a normal installation; it's a fallback for unusual situations.
How are you booting this contraption? Normally, a clean Ubuntu filesystem ready for copying should be mounted on /rofs before Ubiquity is started; casper sets things up this way. ** Changed in: ubiquity (Ubuntu) Status: New => Incomplete ** Visibility changed to: Public -- ubiquity crashed with InstallStepError in umount_source() https://bugs.launchpad.net/bugs/248515 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs