I’ve said it before and I’ll say it again How To Geek knows his bits and bites.
Linux only: If you’re diligent about applying patches to your Ubuntu PC, you’ll soon notice an annoying problem—the boot menu keeps growing bigger every time a kernel patch is installed. Here’s how to clean it up.
Over at the How-To Geek site (my home away from Lifehacker), writer Trevor covers the process of cleaning up the grub boot menu in the latest versions of Ubuntu. Before the days of grub2 in Ubuntu 9.10 and above, cleaning up your boot menu was easy, requiring nothing more than editing the menu.lst file, but the new boot manager doesn’t work the same way.
To clean up old kernel entries from your own boot menu, just head into your package manager and remove the old kernel entries. Hit the link to learn about the full process, including how to manually remove any item, including the extra memtest86+ entry in the list.