graphical interface not starting

[Bruce McCready]

Neither gdm3 or lightdm work; i cannot get a prompt with cntl-alt F1. I think it is probably a configuration issue because the command: systemctl list-dependencies graphical.target does not list any dependencies

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-135.184-generic 3.13.11-ckt39
Uname: Linux 3.13.0-135-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.12
Architecture: amd64
Date: Mon Nov 20 12:07:15 2017
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to xenial on 2017-11-17 (2 days ago)