You appear to be mixing up bios and uefi. If you are going to use uefi,
then you need to have an efi system partition mounted in /boot/grub/efi.
If you are not going to use efi, then you have to boot the install cd in
bios mode.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1299639
Title:
grub-install /dev/sda or /dev/sdc(usb) fails-fatal error
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