--- 10_linux	2018-03-04 14:11:35.000000000 +0100
+++ /etc/grub.d/10_linux	2018-07-08 09:04:49.307828174 +0200
@@ -87,13 +87,15 @@
 
 title_correction_code=
 
-if [ -x /lib/recovery-mode/recovery-menu ]; then
-    GRUB_CMDLINE_LINUX_RECOVERY=recovery
-else
-    GRUB_CMDLINE_LINUX_RECOVERY=single
-fi
-if [ "$ubuntu_recovery" = 1 ]; then
-    GRUB_CMDLINE_LINUX_RECOVERY="$GRUB_CMDLINE_LINUX_RECOVERY nomodeset"
+if [ "x${GRUB_CMDLINE_LINUX_RECOVERY}" = "x" ]; then
+	if [ -x /lib/recovery-mode/recovery-menu ]; then
+	    GRUB_CMDLINE_LINUX_RECOVERY=recovery
+	else
+	    GRUB_CMDLINE_LINUX_RECOVERY=single
+	fi
+	if [ "$ubuntu_recovery" = 1 ]; then
+	    GRUB_CMDLINE_LINUX_RECOVERY="$GRUB_CMDLINE_LINUX_RECOVERY nomodeset"
+	fi
 fi
 
 if [ "$vt_handoff" = 1 ]; then