[ubuntu] grub-customizer removed all Linux entries on dual-boot system

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http://ubuntuforums.org – I have a dual-boot WIn 7/Precise system. I made a mistake with grub-customizer and now at the grub boot menu I can't see any of the Linux entries, just the Win 7 one. What would be the easiest way to boot Linux so I can run grub-customizer again? I can install grub-customizer with the Ubuntu LiveCD, but it asks for a root partition and I don't see one listed. -Thanks! LloydM999 (Hardware)