I booted the installer into rescue mode:

~ # mount /dev/md126p1 /target 
~ # chroot /target grub-install --force "/dev/md126p1"
Installing for i386-pc platform.
grub-install: error: cannot find a device for /boot/grub (is /dev mounted?).

~ # mount
rootfs on / type rootfs (rw)
none on /run type tmpfs (rw,nosuid,relatime,size=404492k,mode=755)
none on /proc type proc (rw,relatime)
none on /sys type sysfs (rw,relatime)
devtmpfs on /dev type devtmpfs 
(rw,relatime,size=2002416k,nr_inodes=500604,mode=755)
devpts on /dev/pts type devpts 
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
/dev/md126p1 on /target type ext4 (rw,relatime,data=ordered)

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https://bugs.launchpad.net/bugs/1587889

Title:
  Installing grub on '/dev/md126p1  system doesn't boot

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