Always disable autologin on normal boot

bin/get-config

@@ -305,6 +305,10 @@ start() {
             rm /local/usbguard >/dev/null 2>&1
             # this is just cleaned up
             echo "" > /local/examid
+            # disable autologin (just in case the service did not work properly)
+            sed -i '/autologin-user=/s/^#*/#/' /etc/lightdm/lightdm.conf
+            sed -i '/session-cleanup-script=/s/^#*/#/' /etc/lightdm/lightdm.conf
+            sed -i '/autologin-session=/s/^#*/#/' /etc/lightdm/lightdm.conf
         else
             # if the examid of the session before the boot is different,
             # then clean the exam user home (if the profile requires it)