Raid installs aren't supported by ubiquity. As a workaround you can
install the mdadm package and configure the raid yourself ( and I assume
you did this ), but you must also then install the package in the target
system as well and install grub yourself.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1765514
Title:
Doing the 18.04-beta-2 install using RAID5 root partition. GRUB2
fails to write to disk.
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