Encountered this bug on 8.04.1:
$ umount /media/32_00_00 /sbin/umount.hal: Unmounting /media/32_00_00 failed: org.freedesktop.Hal.Device.Volume.UnknownFailure: Cannot remove directory
Removed the /media/.hal-mtab and it now works without problems.
Encountered this bug on 8.04.1:
$ umount /media/32_00_00 .Hal.Device. Volume. UnknownFailure: Cannot remove directory
/sbin/umount.hal: Unmounting /media/32_00_00 failed: org.freedesktop
Removed the /media/.hal-mtab and it now works without problems.