dpkg-reconfigure is a command that should be available on all Ubuntu versions. What error did you get when trying to run it?
Autodetection at install-time is different from detecting changes in hardware at all boot-ups. ** Changed in: Ubuntu Status: Unconfirmed => Needs Info -- Adding extra graphics cards; kubuntu won't start X11 https://launchpad.net/bugs/40398 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs