Try this:

sudo -s
mount /dev/md1 /target
for f in proc sys dev dev/pts ; do mount --bind /$f /target/$f ; done
chroot /target
grub-install /dev/sda

I assumed here that /dev/md1 is your root partition; if it is not,
change it accordingly.

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https://bugs.launchpad.net/bugs/1315344

Title:
  Grub install failed on disks with software RAID

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