My mistake, I'd mystyped s21gdm instead of S21gdm. It now works (though it seems like it takes more to open gdm, probably because it does). Maybe some other initscript can be moved after it? I attach my (modified) setup for /etc/rc2.d as a text file.
** Attachment added: "modified setup for rc2.d runlevel dir" http://librarian.launchpad.net/4928794/rc2.d.txt -- Cannot run gdmsetup https://launchpad.net/bugs/66034 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs