diff --git a/debian/postinst b/debian/postinst
index b10ce22..42f21f1 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -197,7 +197,7 @@ EOF
         # Ensure the background image file has actually been written to disc
         # before updating.
         sync
-        update-grub || true
+        update-grub
     fi
 
     if which update-initramfs > /dev/null; then