I came across this problem in Natty (w/latest updates) again today - adding the notification area as noted in my past comment (#31) worked again.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/335662 Title: [jaunty] hplip status service cannot find system tray -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs