There is no requirement for this in the LSB, but it is strongly recommended. Here is a package which should set up your system to run without a GUI for runlevels 1, 2, and 3. Removing the package should set you back to standard Ubuntu. This should work for all ubuntu's including Edgy and Dapper.
** Attachment added: "Makes runlevels more LSB-compliant" http://librarian.launchpad.net/6110055/lsb-runlevels_1.0.deb -- Runlevel 2 starting GUI https://launchpad.net/bugs/14644 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
