Comment 1 for bug 1008353

As a workaround, when you see (*unknown*), delete the corresponding file in db/locks. For example, if you see:

  /home/ed/canonical/maas/sandbox/db: cluster is locked by:
  * 6487 (*unknown*)

do:

  $ rm /home/ed/canonical/maas/sandbox/db/locks/6487

The (*unknown*) bit means that it was unable to determine the command line for that process, which 99% of the time means that process is no longer running.