Changes

Edit the '''gdm.conf''' file and in xdmcp section, comment out the '''0=standard ''' line under the [servers] section - this will prevent gdm from trying to launch an X server on the local machine - it will simply listen for xdmcp requests. Insert '''0=inactive''' in [servers] section. Insert '''Enable=1''' in [xdmcp] section. Also, change from VCAllocation=true to VTAllocation=false and comment out the FirstVT=7 lineif that lines exists. Change the access restrictions (if any) to suit your needs and then start GDM.