root@ubuntu-mate:~# mount /dev/sdb2 /mnt
root@ubuntu-mate:~# mount --bind /dev /mnt/dev && mount --bind /dev/pts 
/mnt/dev/pts && mount --bind /proc /mnt/proc && mount --bind /sys /mnt/sys
root@ubuntu-mate:~# sudo chroot /mnt
root@ubuntu-mate:/# grub-install /dev/sda
Installing for i386-pc platform.
grub-install: warning: this LDM has no Embedding Partition; embedding won't be 
possible.
grub-install: error: embedding is not possible, but this is required for 
cross-disk install.
root@ubuntu-mate:/# grub-install /dev/sdb
Installing for i386-pc platform.
Installation finished. No error reported.
root@ubuntu-mate:/#

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https://bugs.launchpad.net/bugs/1578943

Title:
  when I select /dev/sdb to install grub when /dev/sda fails, still
  error, /dev/sdb is ok

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