It appears that you partitioned your disk with GPT but your computer is
bios based rather than UEFI. To install grub in such a setup requires
that you have a 1 MB bios_grub boot partition on the disk.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1360990
Title:
While installing Ubuntu 14.04 LTS 64 bits I see an error that the GRUB
is unable to install
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