I would like to install Ubuntu 20.04 Focal Fossa on a machine with two hard disks using RAID 1.
Unfortunately it seems this doesn't work. If I use the "Create Software RAID (md)" option and select both my disks the installer tells me:
If you put all disks into RAIDS or LVM VGs, there will be nowhere to put the boot partition.
I found this detailed answer about 18.04 but the problem with this and similar findings on the subject is that Focal dropped the alternative installer so the required partitioning options are gone.
What options do I have to accomplish this?
Best Answer
As I stumbled on the same issue and found out that the actual docs haven't yet been updated for the new storage configurator (still true as of March 2021 and now possibly with a bug on the bios_grub configurator of the installer), here's what I did to get a working softRAID 1 setup with 2 disks on the Ubuntu Server edition (for version 20.04 or newer):
Enjoy :)
(Also referenced on: https://gist.io/@fevangelou/2f7aa0d9b5cb42d783302727665bf80a)