I'm not sure what you mean about extlinux or duplicate entries ( raid doesn't affect the menu ). Please run the boot info script and attach the results:
http://sourceforge.net/projects/bootinfoscript/ ** Changed in: grub2 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1181720 Title: grub with partition detection issues (horribly slow) since recent update in 13.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1181720/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs