This bug was fixed in the package grub-installer - 1.128ubuntu12
--------------- grub-installer (1.128ubuntu12) cosmic; urgency=medium
[ Hans van den Bogert ] * Fix support for installation on NVMe with RAID1 (LP: #1771845)
-- Mathieu Trudel-Lapierre <email address hidden> Fri, 06 Jul 2018 13:16:28 -0400
This bug was fixed in the package grub-installer - 1.128ubuntu12
---------------
grub-installer (1.128ubuntu12) cosmic; urgency=medium
[ Hans van den Bogert ]
* Fix support for installation on NVMe with RAID1 (LP: #1771845)
-- Mathieu Trudel-Lapierre <email address hidden> Fri, 06 Jul 2018 13:16:28 -0400