Can you please elaborate on what "unable to log in" means, i.e. what happens? Does the computer freeze, or are you taken back to the login screen?
Also, can you please let us know the contents of ~/.xsession-errors and ~/.xsession-errors.old when you log in via console right after a failed attempt at a graphical login. ** Changed in: lightdm (Ubuntu) Status: New => Incomplete -- 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/1408275 Title: Unable to log in with lightdm Status in Light Display Manager: New Status in lightdm package in Ubuntu: Incomplete Bug description: Unable to log in with lightdm This is a bug report against an up-to-date version of (k)ubuntu 14.10/utopic. The issue seems to have been triggered by ubuntu updates between 23.12.2014 and 07.01.2015 (today). I'm unable to log in with lightdm. No matter what user, and I also tried guest. However I'm able to log on a (non-graphical) console/vt (i.e. without X). I found the following in /var/log/lightdm/x-0-greeter.log: QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: Datei oder Verzeichnis nicht gefunden QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus Bus::open: Can not get ibus-daemon's address. IBusInputContext::createInputContext: no connection to ibus-daemon QDBusError("org.freedesktop.DBus.Error.AccessDenied", "Permission denied") QDBusError("org.freedesktop.DBus.Error.AccessDenied", "Permission denied") QDBusError("org.freedesktop.DBus.Error.AccessDenied", "Permission denied") QDBusError("org.freedesktop.DBus.Error.AccessDenied", "Permission denied") file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:246:5: QML ListView: Bei der fÃ<U+0083>¼r die Eigenschaft âÂ<U+0080>Â<U+009E>currentIndexâÂ<U+0080> <U+009C> angegebenen Bindung wurde eine Endlosschleife festgestellt file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:246:5: QML ListView: Bei der fÃ<U+0083>¼r die Eigenschaft âÂ<U+0080>Â<U+009E>currentIndexâÂ<U+0080> <U+009C> angegebenen Bindung wurde eine Endlosschleife festgestellt file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: Unable to assign [undefined] to QString usersession Hence the bug maybe releated to some ibus, dbus, systemd and/or upstart problem. But I don't care. This is the most severe problem for me in Ubuntu for nearly 10 years. To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1408275/+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