I ran into this updating my wife's computer. It appears to have been caused by a comment at the end of one line of /etc/fstab, which the python code fails to ignore. Removing the comment allowed the upgrade to continue.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/873581 Title: do-release-upgrade fails again while upgrading from 11.04 to 11.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/873581/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs