Reply To: cannot connect with ubuntu server using XDMCP . . . 3. October 2008 at 16:34 #14060 papalMember Total Post: 17Regular Joe★★ I gave up with 8.04, and stuck with 7.04. Ubuntu 8.04 had another showstopper bug where the maximum number of X sessions was set to 16 by GDM regardless of what you set it to in gdm.conf or gdm.conf-custom.