It's added automatically by the installer (which is the only thing that writes entries to that file).
It wasn't added for a brief period during a development cycle (dapper, I think) ** Changed in: udev (Ubuntu) Status: Needs Info => Fix Released -- kernel 2.6.17-6 does boot slowly on Thinkpad T43p https://launchpad.net/bugs/56249 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs