Comment 2 for bug 877520

Please can you confirm if you are using btrfs, as there are multiple references to potential issues:

2011-10-18 15:00:34,206 WARNING unexpected target md5sum, skipping: '/usr/bin/pycompile'
2011-10-18 15:00:34,236 DEBUG killing update-notifier
2011-10-18 15:00:34,252 DEBUG killing kblueplugd kbluetooth4
2011-10-18 15:00:34,264 DEBUG killing gnome-screensaver
2011-10-18 15:00:34,286 DEBUG quirks: running oneiricStartUpgrade
2011-10-18 15:00:34,286 DEBUG oneiric StartUpgrade quirks
2011-10-18 15:00:34,357 ERROR failed to check btrfs support
Traceback (most recent call last):
  File "/tmp/update-manager-bhwgBB/DistUpgradeController.py", line 1006, in _is_apt_btrfs_snapshot_supported
    apt_btrfs = apt_btrfs_snapshot.AptBtrfsSnapshot()
  File "/tmp/update-manager-bhwgBB/apt_btrfs_snapshot.py", line 85, in __init__
    self.fstab = Fstab(fstab)
  File "/tmp/update-manager-bhwgBB/apt_btrfs_snapshot.py", line 53, in __init__
    entry = FstabEntry.from_line(line)
  File "/tmp/update-manager-bhwgBB/apt_btrfs_snapshot.py", line 31, in from_line
    return FstabEntry(*line.partition("#")[0].split())
TypeError: __init__() takes at least 5 arguments (2 given)

thanks.