As I cannot reproduce the problem I can only guess - most likely are there several zeitgeist-daemon or zeitgeist-fts running which are locking the database.
Can you check the following: ps -ef | grep zeitgeist copy the output and then kill all the processes. See whether it works - if it does the output of the command would be helpful. ** Summary changed: - failure of clearing history and adding item due to "Failed to clear items: GDBus.Error:org.gnome.zeitgeist.EngineError.DatabaseError: engine.vala:392: SQL Error: 5, database is locked" should be more interactive + database is locked error prevents Diodon from adding items to or clearing history ** Also affects: diodon Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1405525 Title: database is locked error prevents Diodon from adding items to or clearing history To manage notifications about this bug go to: https://bugs.launchpad.net/diodon/+bug/1405525/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs