Unable to switch login at xscreensaver lock screen

[Johnny Ooi]

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)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Tormod Volden (tormodvolden)]

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.