Pygrub doesn't detect the grub2 config file when it's on a separate /boot partition. This should fix it.

--- /a/usr/bin/pygrub   2010-03-04 12:32:36.000000000 +0000

+++ /b/usr/bin/pygrub   2010-03-05 08:16:57.000000000 +0000

@@ -383,7 +383,7 @@

                            ["/boot/grub/menu.lst", "/boot/grub/grub.conf",

                             "/grub/menu.lst", "/grub/grub.conf"]) + \

                        map(lambda x: (x,grub.GrubConf.Grub2ConfigFile),

-                           ["/boot/grub/grub.cfg"])

+                           ["/boot/grub/grub.cfg","/grub/grub.cfg"])

         if not fs:

             # set the config file and parse it