XFCE (or whatever is launching the xscreensaver daemon) should tell xscreensaver how a new session should be launched, like here: http://anonscm.debian.org/cgit/collab-maint/xscreensaver.git/tree/debian /xscreensaver-wrapper.sh
I guess Saucy had "gdmflexiserver" but Trusty doesn't. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xscreensaver in Ubuntu. https://bugs.launchpad.net/bugs/1309917 Title: Unable to switch login at xscreensaver lock screen Status in “xscreensaver” package in Ubuntu: Confirmed Bug description: When xscreensaver locks the session and a user attempts to start a new session via the "New Login" button, the message "Could not execute 'gdmflexiserver'" is displayed. This has only started to occur since upgrade from Saucy to Trusty and has occurred on two machines. The one on which I'm reporting this error on (a laptop running Ubuntu Studio upgraded from Saucy to Trusty) and a second (a desktop running Lubuntu, also upgraded from Saucy to Trusty) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xscreensaver 5.15-3ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-24.46-lowlatency 3.13.9 Uname: Linux 3.13.0-24-lowlatency i686 ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 CurrentDesktop: XFCE Date: Sat Apr 19 11:39:29 2014 InstallationDate: Installed on 2014-02-15 (62 days ago) InstallationMedia: Ubuntu-Studio 13.10 "Saucy Salamander" - Release i386 (20131016.1) SourcePackage: xscreensaver UpgradeStatus: Upgraded to trusty on 2014-04-18 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xscreensaver/+bug/1309917/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

