I've been using KDM previously, but have decided to try LightDM.
So I installed lightdm and lighdm-kde-greeter, then I
systemctl disable kdm
systemctl enable lightdm
However, when I type in my username and password, the login window disappears and nothing happens. The log (when I try using --testmode-debug) shows:
[+20.67s] DEBUG: Session pid=2565: User ... authorized
[+21.34s] DEBUG: Session pid=2565: Greeter requests session kde-plasma
[+21.34s] CRITICAL: g_dbus_connection_call_sync_internal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed
[+21.34s] DEBUG: Writing /home/.../.dmrc
[+21.39s] DEBUG: Seat: Returning to existing user session ...
[+21.39s] DEBUG: Session pid=2575: Sending SIGTERM
[+21.39s] DEBUG: Session pid=2575: Terminated with signal 15
[+21.39s] DEBUG: Seat: Session stopped
Any idea how to fix this?
Did you follow all the instruction from the wiki?
You may try to delete all the configuration files (/etc/lightdm/), reinstall lightdm and lighdm-kde-greeter, and try again.
Also, try with another greeter to see if it works.
What I hear, I forget. What I say, I remember. What I do, I understand. –Tao Te Ching/Laozi