Public bug reported:

Setup:
Laptop + external monitor
Output set to be on external only

Test Case:
1. Boot the system

Actual result
After boot there is a purple screen but the login dialog is not displayed and 
the user cannot login
It is not possible to switch to the laptop internal monitor either with the 
keyboard function keys or by unplugging the cable.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gdm3 3.26.1-3ubuntu2
ProcVersionSignature: Ubuntu 4.13.0-15.16-generic 4.13.4
Uname: Linux 4.13.0-15-generic x86_64
ApportVersion: 2.20.7-0ubuntu2
Architecture: amd64
Date: Thu Oct 12 09:40:56 2017
InstallationDate: Installed on 2013-09-03 (1499 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902)
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2017-09-06T19:41:19.336760

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1723025

Title:
  no login screen when booting with an external monitor attached

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