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Can't login as user. Not in a TTY, not in lightdm

Everything works as root. I can startx, and get into iceWM. I'll be using i3, but that works aswell through lightdm if I login as "other" then write "root".

Loging in in a TTY works aswell, but only as root. When I try loging in as a user, it hangs for a moment, and go back to exactly the way it was before.

Here's the results of #journalctl -f while trying to open i3 through lightdm as a normal user.

nux-v80v:~ # journalctl -f -- Logs begin at Wed 2019-01-16 15:40:46 CET. -- Jan 16 15:44:27 linux-v80v dbus-daemon[2587]: [session uid=469 pid=2587] Successfully activated service 'org.a11y.Bus' Jan 16 15:44:27 linux-v80v systemd[2571]: Started Accessibility services bus. Jan 16 15:44:27 linux-v80v at-spi-bus-launcher[2588]: dbus-daemon[2593]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=469 pid=2577 comm="/usr/sbin/lightdm-gtk-greeter ") Jan 16 15:44:27 linux-v80v dbus-daemon[2587]: [session uid=469 pid=2587] Activating via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service' requested by ':1.3' (uid=469 pid=2577 comm="/usr/sbin/lightdm-gtk-greeter ") Jan 16 15:44:27 linux-v80v at-spi-bus-launcher[2588]: dbus-daemon[2593]: Successfully activated service 'org.a11y.atspi.Registry' Jan 16 15:44:27 linux-v80v at-spi-bus-launcher[2588]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry Jan 16 15:44:27 linux-v80v systemd[2571]: Starting Virtual filesystem service... Jan 16 15:44:27 linux-v80v chronyd[1535]: Selected source 185.175.56.126 Jan 16 15:44:27 linux-v80v dbus-daemon[2587]: [session uid=469 pid=2587] Successfully activated service 'org.gtk.vfs.Daemon' Jan 16 15:44:27 linux-v80v systemd[2571]: Started Virtual filesystem service. Jan 16 15:44:51 linux-v80v systemd[1]: session-5.scope: Killing process 2561 (lightdm) with signal SIGTERM. Jan 16 15:44:51 linux-v80v systemd[1]: session-5.scope: Killing process 2577 (lightdm-gtk-gre) with signal SIGTERM. Jan 16 15:44:51 linux-v80v systemd[1]: Stopping Session 5 of user lightdm. Jan 16 15:44:51 linux-v80v lightdm[2561]: pam_unix(lightdm-greeter:session): session closed for user lightdm Jan 16 15:44:51 linux-v80v systemd[1]: Stopped Session 5 of user lightdm. Jan 16 15:44:51 linux-v80v systemd-logind[1532]: Removed session 5. Jan 16 15:44:51 linux-v80v systemd[1]: Stopping User Manager for UID 469... Jan 16 15:44:51 linux-v80v systemd[2571]: Stopping Accessibility services bus... Jan 16 15:44:51 linux-v80v systemd[2571]: Stopping D-Bus User Message Bus... Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped target Default. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopping Virtual filesystem service... Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped D-Bus User Message Bus. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped Accessibility services bus. Jan 16 15:44:51 linux-v80v lightdm[1995]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed Jan 16 15:44:51 linux-v80v systemd[1]: Created slice User Slice of mats. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped Virtual filesystem service. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped target Basic System. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped target Timers. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped target Sockets. Jan 16 15:44:51 linux-v80v systemd[2571]: Closed D-Bus User Message Bus Socket. Jan 16 15:44:51 linux-v80v systemd[2571]: Stopped target Paths. Jan 16 15:44:51 linux-v80v systemd[2571]: Reached target Shutdown. Jan 16 15:44:51 linux-v80v systemd[2571]: Starting Exit the Session... Jan 16 15:44:51 linux-v80v systemd[1]: Starting User Manager for UID 1000... Jan 16 15:44:51 linux-v80v systemd-logind[1532]: New session 6 of user mats. Jan 16 15:44:51 linux-v80v systemd[2571]: Received SIGRTMIN+24 from PID 2636 (kill). Jan 16 15:44:51 linux-v80v systemd[1]: Started Session 6 of user mats. Jan 16 15:44:51 linux-v80v systemd[2635]: pam_unix(systemd-user:session): session opened for user mats by (uid=0) Jan 16 15:44:51 linux-v80v systemd[2635]: Reached target Paths. Jan 16 15:44:51 linux-v80v systemd[2635]: Reached target Timers. Jan 16 15:44:51 linux-v80v systemd[2572]: pam_unix(systemd-user:session): session closed for user lightdm Jan 16 15:44:51 linux-v80v systemd[2635]: Starting D-Bus User Message Bus Socket. Jan 16 15:44:51 linux-v80v systemd[1]: Stopped User Manager for UID 469. Jan 16 15:44:51 linux-v80v systemd[1]: Removed slice User Slice of lightdm. Jan 16 15:44:51 linux-v80v systemd[2635]: Listening on D-Bus User Message Bus Socket. Jan 16 15:44:51 linux-v80v systemd[2635]: Reached target Sockets. Jan 16 15:44:51 linux-v80v systemd[2635]: Reached target Basic System. Jan 16 15:44:51 linux-v80v systemd[2635]: Reached target Default. Jan 16 15:44:51 linux-v80v systemd[2635]: Startup finished in 26ms. Jan 16 15:44:51 linux-v80v lightdm[2619]: pam_unix(lightdm:session): session opened for user mats by (uid=0) Jan 16 15:44:51 linux-v80v systemd[1]: Started User Manager for UID 1000. Jan 16 15:44:51 linux-v80v systemd[2635]: Started D-Bus User Message Bus. v y Jan 16 15:48:12 linux-v80v lightdm[2619]: pam_unix(lightdm:session): session closed for user mats Jan 16 15:48:12 linux-v80v systemd-logind[1532]: Removed session 6. Jan 16 15:48:12 linux-v80v systemd[1]: Stopping User Manager for UID 1000... Jan 16 15:48:12 linux-v80v systemd[2635]: Stopping D-Bus User Message Bus... Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped target Default. Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped D-Bus User Message Bus. Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped target Basic System. Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped target Timers. Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped target Sockets. Jan 16 15:48:12 linux-v80v systemd[2635]: Stopped target Paths. Jan 16 15:48:12 linux-v80v systemd[2635]: Closed D-Bus User Message Bus Socket. Jan 16 15:48:12 linux-v80v systemd[2635]: Reached target Shutdown. Jan 16 15:48:12 linux-v80v systemd[2635]: Starting Exit the Session... Jan 16 15:48:12 linux-v80v systemd[2635]: Received SIGRTMIN+24 from PID 2734 (kill). Jan 16 15:48:12 linux-v80v systemd[2637]: pam_unix(systemd-user:session): session closed for user mats Jan 16 15:48:12 linux-v80v systemd[1]: Stopped User Manager for UID 1000. Jan 16 15:48:12 linux-v80v systemd[1]: Removed slice User Slice of mats. Jan 16 15:48:13 linux-v80v lightdm[1995]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed Jan 16 15:48:13 linux-v80v systemd[1]: Created slice User Slice of lightdm. Jan 16 15:48:13 linux-v80v systemd[1]: Starting User Manager for UID 469... Jan 16 15:48:13 linux-v80v systemd-logind[1532]: New session 7 of user lightdm. Jan 16 15:48:13 linux-v80v systemd[1]: Started Session 7 of user lightdm. Jan 16 15:48:13 linux-v80v systemd[2758]: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0) Jan 16 15:48:13 linux-v80v systemd[2758]: Reached target Paths. Jan 16 15:48:13 linux-v80v systemd[2758]: Reached target Timers. Jan 16 15:48:13 linux-v80v systemd[2758]: Starting D-Bus User Message Bus Socket. Jan 16 15:48:13 linux-v80v systemd[2758]: Listening on D-Bus User Message Bus Socket. Jan 16 15:48:13 linux-v80v systemd[2758]: Reached target Sockets. Jan 16 15:48:13 linux-v80v systemd[2758]: Reached target Basic System. Jan 16 15:48:13 linux-v80v systemd[2758]: Reached target Default. Jan 16 15:48:13 linux-v80v systemd[2758]: Startup finished in 23ms. Jan 16 15:48:13 linux-v80v systemd[1]: Started User Manager for UID 469. Jan 16 15:48:13 linux-v80v lightdm[2748]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0) Jan 16 15:48:13 linux-v80v systemd[2758]: Started D-Bus User Message Bus. Jan 16 15:48:13 linux-v80v dbus-daemon[2774]: [session uid=469 pid=2774] Activating systemd to hand-off: service name='org.a11y.Bus' unit='at-spi-dbus-bus.service' requested by ':1.0' (uid=469 pid=2764 comm="/usr/sbin/lightdm-gtk-greeter ") Jan 16 15:48:13 linux-v80v dbus-daemon[2774]: [session uid=469 pid=2774] Successfully activated service 'org.freedesktop.systemd1' Jan 16 15:48:13 linux-v80v systemd[2758]: Starting Accessibility services bus... Jan 16 15:48:13 linux-v80v dbus-daemon[2774]: [session uid=469 pid=2774] Successfully activated service 'org.a11y.Bus' Jan 16 15:48:13 linux-v80v systemd[2758]: Started Accessibility services bus. Jan 16 15:48:13 linux-v80v at-spi-bus-launcher[2775]: dbus-daemon[2780]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=469 pid=2764 comm="/usr/sbin/lightdm-gtk-greeter ") Jan 16 15:48:13 linux-v80v dbus-daemon[2774]: [session uid=469 pid=2774] Activating via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service' requested by ':1.3' (uid=469 pid=2764 comm="/usr/sbin/lightdm-gtk-greeter ") Jan 16 15:48:13 linux-v80v systemd[2758]: Starting Virtual filesystem service... Jan 16 15:48:13 linux-v80v at-spi-bus-launcher[2775]: dbus-daemon[2780]: Successfully activated service 'org.a11y.atspi.Registry' Jan 16 15:48:13 linux-v80v at-spi-bus-launcher[2775]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry Jan 16 15:48:13 linux-v80v dbus-daemon[2774]: [session uid=469 pid=2774] Successfully activated service 'org.gtk.vfs.Daemon' Jan 16 15:48:13 linux-v80v systemd[2758]: Started Virtual filesystem service

When I login as root in a TTY and do su mats, I get su: failed to execute /usr/bin/fish: No such file or directory

Thanks in advice.