Unable to log in with lightdm

[aanno]

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>Â
<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>Â
<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.

[Gunnar Hjalmarsson (gunnarhj)]

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.

[aanno (thomas-pasch)]

Sorry for being fuzzy. This is what happens:

# lightdm greeting screen comes up after boot as expected.
# trying to log in from the lightdm greeting screen (with whatever user to whatever desktop environment)
# X11 is stopped, screen falls back to vt (black screen with a few white characters on it) for half a second or so. There is some output (error message) on vt, but there is no time for me to read it.
# lightdm greeting screen is started again. I'm still not logged-in (but I can try over and over again).

Work-around:
As already mentioned, logging in is possible by:
# Cntrl-Alt-F2 (or some other combination) to get to a (non-graphical) vt.
# Log in (non-graphical, i.e. without X11, lightdm greeting screen) on the vt
# Starting the X11 user session, e.g. with 'startx /usr/bin/startkde -- :3'

[Gunnar Hjalmarsson (gunnarhj)]

Thanks, aanno. Can you also show the contents of ~/.xsession-errors and ~/.xsession-errors.old.

[Rolf Leggewie (r0lf)]

ping aanno