Thank you for your answers. The original problem is the following. I run a Debian server with many users. On users requests, I often install defferent packages. I am sure that many of those are no longer needed by the users that requested them. So I want to find and uninstall those. -- To UNSUBSCRIBE, email to debian-user-request@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org