diff --git a/debian/postinst b/debian/postinst
index d51147d..e160f8b 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -17,7 +17,7 @@ fi
 
 if [ "$1" = configure|upgrade ]; then
   if [ -x /usr/lib/lightdm/lightdm-set-defaults ] ; then
-    /usr/lib/lightdm/lightdm-set-defaults --keep-old --session=lubuntu || true
+    /usr/lib/lightdm/lightdm-set-defaults --keep-old --session=Lubuntu || true
     /usr/lib/lightdm/lightdm-set-defaults --keep-old --greeter=lightdm-gtk-greeter || true
   fi
 fi
diff --git a/debian/postrm b/debian/postrm
index 738e214..8623a9c 100644
--- a/debian/postrm
+++ b/debian/postrm
@@ -9,7 +9,7 @@ fi
 case "$1" in
   remove|purge)
     if [ -x /usr/lib/lightdm/lightdm-set-defaults ] ; then
-      /usr/lib/lightdm/lightdm-set-defaults --remove --session=lubuntu || true
+      /usr/lib/lightdm/lightdm-set-defaults --remove --session=Lubuntu || true
       /usr/lib/lightdm/lightdm-set-defaults --remove --greeter=lightdm-gtk-greeter || true
     fi
     ;;