Comment 99 for bug 453579

We don't know the cause, so that's hard to answer. So far it seems that ext3
--> ext4 conversions are safe. Kind of makes sense, since the on-disk system
is a bit different. As to whether created-by-Karmic or in-use-by-Karmic is
the trouble here, we don't know yet. I think only 3 people so far have hit
this, and we all were running unstable for development reasons, so we had
created-by-Karmic filesystems. It's going to take more people reproducing it
to find out if created-by-Jaunty-and-used-in-Karmic is problematic as well.