diff -Nru xdiagnose-2.5.2ubuntu0.1/bin/xdiagnose xdiagnose-2.5.3/bin/xdiagnose
--- xdiagnose-2.5.2ubuntu0.1/bin/xdiagnose	2012-03-17 02:37:34.000000000 +0000
+++ xdiagnose-2.5.3/bin/xdiagnose	2013-04-23 22:14:38.000000000 +0000
@@ -59,6 +59,10 @@
         sys.stderr.write("Could not open X display\n")
         sys.exit(1)
 
+    if os.getenv("USER") != "root":
+        sys.stderr.write("Error: Must run as superuser\n")
+        sys.exit(2)
+
     # Run the application.
     if options.failure_to_start:
         app = XDiagnose()
diff -Nru xdiagnose-2.5.2ubuntu0.1/debian/changelog xdiagnose-2.5.3/debian/changelog
--- xdiagnose-2.5.2ubuntu0.1/debian/changelog	2012-10-01 22:34:48.000000000 +0000
+++ xdiagnose-2.5.3/debian/changelog	2013-04-23 22:14:04.000000000 +0000
@@ -1,3 +1,11 @@
+xdiagnose (2.5.3) precise-proposed; urgency=low
+
+  * bin/xdiagnose:  Exit with error if run as non-root.  Otherwise, the
+    program will crash when it tries to write a new grub configuration.
+    (LP: #769419)
+
+ -- Bryce Harrington <bryce@ubuntu.com>  Tue, 23 Apr 2013 15:13:13 -0700
+
 xdiagnose (2.5.2ubuntu0.1) precise-security; urgency=low
 
   * SECURITY UPDATE: fix insecure temporary file creation