I use Mate 17.04.
I got some error messages in the LOG File-Viewer:
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1862 (lightdm) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1870 (gnome-keyring-d) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1873 (lightdm-greeter) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1878 (dbus-daemon) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1879 (lightdm-gtk-gre) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1881 (at-spi-bus-laun) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1887 (dbus-daemon) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1889 (at-spi2-registr) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1894 (gvfsd) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: session-c2.scope: Killing process 1899 (gvfsd-fuse) with signal SIGTERM.
Jan 1 13:08:30 amd systemd[1]: Stopping Session c2 of user lightdm.
Jan 1 13:08:30 amd lightdm[1645]: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed
What is wrong? Can somebody help please? Thanks!