/sbin must be in all users path on Ubuntu. It is the default, and many thing will not work, if /sbin is not the default path.
Default path on ubuntu is usually set in /etc/environment and has: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games" Can you please verify what PATH is set on the affected environments? -- 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/1228079 Title: Login issue: Lightdm + LDAP + Kerberos Status in “lightdm” package in Ubuntu: Confirmed Bug description: lightdm 1.7.15-0ubuntu1, Ubuntu 13.10 - Local users can login without problems on command line and LightDM - Kerberos/LDAP authenticated users can login on command line - Kerberos/LDAP authenticated users cannot login with LigthDM. If you provide a valid user/password the screen gets blank before you return to the login screen. The .xession-errors includes "/usr/sbin/lightdm- session: 5: exec: init: not found" - If you add init to the users path (e.g., ln -s /sbin/init /bin/init) the user does no longer return back to LightDM but gets a blank screen. Several errors related to "init" in the .xsession-errors. First of them is "init: Failed to spawn upstart-file-bridge main process: unable to execute: No such file or directory" .xession-errors for both setup attached to this bug report No problems with Ubuntu 12.04. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: lightdm 1.7.15-0ubuntu1 ProcVersionSignature: Ubuntu 3.11.0-7.14-generic 3.11.1 Uname: Linux 3.11.0-7-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 Date: Fri Sep 20 12:21:13 2013 InstallationDate: Installed on 2013-09-20 (0 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130917) MarkForUpload: True ProcEnviron: LANGUAGE=de_DE TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1228079/+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