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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