You are using a fake raid. You must install grub to the raid (
/dev/mapper/isw_cegbjaiedd_ARRAY ), and never touch the individual disks
that make it up ( /dev/sda ).
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1431112
Title:
Failure to write to raid array /dev/sda during LVM install
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