It seems to be an issue with 10.04 systems, even a brand new 10.04.3 desktop install I made last week had it. I have subsequently found that others have reported it:
https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/739007 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/616287 Title: umountfs doesn't cleanly unmount / on reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/616287/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
