Software RAID GRUB Fix

Fix Software RAID1 GRUB as root on booted system if GRUB is installed on /dev/sda:

grub-install --modules=mdraid1x /dev/sdb
update-grub /dev/sdb

Also, confirm GRUB is installed both drives:

dpkg-reconfigure grub-pc

Fix Grub booting not reading config:

vi /etc/default/grub

Add "rootdelay=10" to "GRUB_CMDLINE_LINUX_DEFAULT" to:

 GRUB_CMDLINE_LINUX_DEFAULT="quiet rootdelay=10"