diff --git a/debian/changelog b/debian/changelog
index 74f1e9d..8e25abf 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,8 @@
 desktop-base (9.0.1) UNRELEASED; urgency=medium
 
   [ Aurélien COUDERC ]
+  * postinst: Report success even when update-grub fails, this is needed
+    for installation to work inside live systems. (Closes: #850601).
   * Plymouth/{softWaves,Lines,Joy}: provide fsckd progress support.
     (Closes: #850181)
   * Plymouth/softWaves: raise messages and password field a little.
diff --git a/debian/postinst b/debian/postinst
index 6112a3a..31c44e0 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -201,7 +201,11 @@ EOF
         # Ensure the background image file has actually been written to disc
         # before updating.
         sync
-        update-grub
+        # Report success whatever grub return status. This is needed at least
+        # in live systems fon installation to succeed (see #850601).
+        # Until we find a better solution like detecting we’re in a live image
+        # and not calling update-grub at all.
+        update-grub || echo "Updating grub failed, report success anyway!"
     fi
 
     if which update-initramfs > /dev/null; then