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 [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
