You receive the following error when running the AutoPilot Product Maintenance (package manager):
Warning: Package database is currently locked. Please try later
If you are sure that no one else is currently running AutoPilot Product Maintenance, you can delete the locked file. In your AUTOPILOT_HOME folder, remove the file packages.xml.lock. If the file is not present, than the error might be the result of a permissions issue. Verify that the user has access to the folder.