Ok, then we know that the issue is not a result of your $HOME having been messed up due to multiple desktops. (A guest session is started with a fresh $HOME.)
Thanks for your helpful responsiveness! Now let's wait for someone else to attend to this bug report. ** Changed in: lightdm (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1613430 Title: lightdm not showing gnome desktop option Status in lightdm package in Ubuntu: New Bug description: I installed ubuntu-gnome-desktop and selected lightdm as the display manager (tried gdm and received only a purple screen). When I click on the ubuntu logo to the right of my login (where I believe I should be able to select the desktop I would like to use) the login name(s) disappear and nothing happens until I hit enter at which point the login names reappear I have tried logging out and back in again as well as rebooting with the same results. I am currently on a Dell XPS 13 Developer Edition (Ubuntu laptop). I am able to log into Unity with no problem but I would like to use Gnome. --- ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity DistroRelease: Ubuntu 16.04 InstallationDate: Installed on 2016-07-26 (19 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) JournalErrors: Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system. Users in the 'systemd-journal' group can see all messages. Pass -q to turn off this notice. No journal files were opened due to insufficient permissions. Package: lightdm 1.18.2-0ubuntu2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15 Tags: xenial third-party-packages Uname: Linux 4.4.0-34-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1613430/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp