When this happened to me, synaptic was holding the lock, and the instance opened by update-manager was trying to aquire it
-- update-apt-xapian-index crashed with DatabaseLockError in __init__() https://bugs.launchpad.net/bugs/622956 You received this bug notification because you are a member of Ubuntu Bug Control, which is a direct subscriber. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-bugcontrol Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-bugcontrol More help : https://help.launchpad.net/ListHelp

