I unchecked 'Enable-3D acceleration' in the VM settings then I reinstalled Ubuntu 16.04.1 and installed the guest additions, rebooted, lightdm did not crash at start up.
-- 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/1620631 Title: Lightdm crashes on bootup after installing Virtualbox guest addition tools on Ubuntu Desktop 16.04.1 Status in lightdm package in Ubuntu: New Bug description: After a clean install of Ubuntu 16.04.1 on Virtualbox, when I install the guest additions to it and reboot the lightdm display manager continually restarts and then errors out. I'm left the other tty terminals which sometimes do not work. Uninstalling the guest addition tools in /opt and rebooting fixes the issue. Virtualbox version: 5.1.4 r1110228 VBoxGuestAdditions-5.1.4 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm (not installed) ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16 Uname: Linux 4.4.0-36-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 Date: Tue Sep 6 08:38:03 2016 InstallationDate: Installed on 2016-09-02 (3 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) ProcEnviron: TERM=linux PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) What I've tried for troubleshooting - Removing .Xauthority Verifying permissions on various lightdm system folders. Upgrading virtualbox Purging / uninstalling and reinstalling lightdm dpkg-reconfigure lightdm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1620631/+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
