This isn't a LightDM problem, it's either your script is not valid or X / your video drivers have changed.
I'd suggest you make your script not abort when xrandr fails. ** Package changed: lightdm (Ubuntu) => xorg-server (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1644624 Title: lightdm does not start after upgrade from 14.04.5 to 16.04.1 Status in xorg-server package in Ubuntu: New Bug description: After upgrading from 14.04.5 to 16.04.1 lightdm does not start. Only error I could find reported was: [+0.19s] DEBUG: Launching process 1927: /usr/share/lightdm_xrandr [+0.21s] DEBUG: Process 1927 exited with return value 1 [+0.21s] DEBUG: Seat seat0: Exit status of /usr/share/lightdm_xrandr: 1 [+0.21s] DEBUG: Seat seat0: Stopping display server due to failed setup script [+0.21s] DEBUG: Sending signal 15 to process 1922 [+0.59s] DEBUG: Process 1922 exited with return value 0 Looking at /usr/share/lightdm_xrandr output: #!/bin/sh xrandr --output Virtual1 --primary --mode 1920x1200 # /usr/share/lightdm_xrandr xrandr: Failed to get size of gamma for output default warning: output Virtual1 not found; ignoring # xrandr --listproviders Providers: number : 0 # xrandr --listmonitors xrandr: Failed to get size of gamma for output default Monitors: 1 0: +*default 1920/508x1200/317+0+0 default Changing xrandr --output Virtual1 --primary --mode 1920x1200 to xrandr --output default --primary --mode 1920x1200 leads to display of 1024x768 on a monitor capable of 1920x1200. Doesn't look nice! It worked with 14.04.5 seamless. I'd never had to think of it until upgrading! ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm 1.18.3-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24 Uname: Linux 4.4.0-47-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 Date: Thu Nov 24 19:19:53 2016 InstallationDate: Installed on 2014-02-10 (1017 days ago) InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016) LightdmConfig: [Seat:*] display-setup-script=/usr/share/lightdm_xrandr greeter-session=lightdm-gtk-greeter user-session=xubuntu ProcEnviron: TERM=screen PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: Upgraded to xenial on 2016-11-24 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1644624/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
