If someone gets here because the machine keeps detecting the disabled video card and not the external one, something good to know is that typing the "live xforcevesa" as the boot command would at least make the Live CD to boot.
-- wrong primary display selected in multihead setup (PCI bus enumeration order) https://launchpad.net/bugs/55928 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
