do-release-upgrade fails again while upgrading from 11.04 to 11.10

[Bartłomiej Żogała]

File "/tmp/update-manager-pxGtoG/DistUpgradeMain.py", line 199, in
main
if app.run():

File "/tmp/update-manager-pxGtoG/DistUpgradeController.py", line
1670, in run
return self.fullUpgrade()

File "/tmp/update-manager-pxGtoG/DistUpgradeController.py", line
1627, in fullUpgrade
if not self.askDistUpgrade():

File "/tmp/update-manager-pxGtoG/DistUpgradeController.py", line 895,
in askDistUpgrade
if not self._checkFreeSpace():

File "/tmp/update-manager-pxGtoG/DistUpgradeController.py", line 861,
in _checkFreeSpace
with_snapshots = self._is_apt_btrfs_snapshot_supported()

File "/tmp/update-manager-pxGtoG/DistUpgradeController.py", line
1005, in _is_apt_btrfs_snapshot_supported
apt_btrfs = apt_btrfs_snapshot.AptBtrfsSnapshot()

File "/tmp/update-manager-pxGtoG/apt_btrfs_snapshot.py", line 85, in
__init__
self.fstab = Fstab(fstab)

File "/tmp/update-manager-pxGtoG/apt_btrfs_snapshot.py", line 53, in
__init__
entry = FstabEntry.from_line(line)

File "/tmp/update-manager-pxGtoG/apt_btrfs_snapshot.py", line 31, in
from_line
return FstabEntry(*line.split())

TypeError: __init__() takes at most 7 arguments (9 given)
=== Command detached from window (Thu Oct 13 20:19:12 2011) ===
=== Command terminated with exit status 1 (Thu Oct 13 20:19:12 2011) ===

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Scott Sweeny (ssweeny)]

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.