This bug affects me too on Ubuntu 12.04.3 and even after updates it
persists! I have being using Linux Mint 13 (which based on Ubuntu 12.4)
and never had any issues like that and my hardware is not defective!
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Bugs, which is
Public bug reported:
I have Installed Linux Mint 13 Mate 64bit alongside Linux Mint 14
Cinnamon 64bit to replace Linux Mint 14 Mate 64bit. Now I get entries
related to the old OS. I have installed Grub-customizer and removed
them. But there are other entries that don't show up in Grub Customizer
