Windows converted the disk to a "dynamic disk", which is not supported.
You will need to convert it back to a "basic disk".


** Changed in: grub-installer (Ubuntu)
       Status: New => Invalid

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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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