Reinstall grub2 on Mint 17.1, Ubuntu 14.04, Xubuntu 14.04

$ sudo apt-get remove --purge grub-common grub-pc-bin grub-pc grub2-common grub-gfxpayload-lists

$ sudo apt-get install grub-common grub-pc-bin grub-pc grub2-common grub-gfxpayload-lists