The system has three disks /dev/sda /dev/sdb /dev/nvme0n1
I'm not sure why, but it appears that /dev/sda has been used for installing the 
bootloader, at least a little. I'm not sure why, and whether it is a UI bug or 
grub-installer logic.

$ zgrep -e sda -e nvme syslog.gz | grep grub-install
Jan 31 16:01:48 grub-installer: info: Identified partition label for 
/dev/nvme0n1p2: gpt
Jan 31 16:01:48 grub-installer: info: Wiping PReP partition /dev/nvme0n1p1
Jan 31 16:01:52 in-target: Failed: grub-install --target=powerpc-ieee1275 
/dev/sda1 ^M
Jan 31 16:01:57 grub-installer: info: Installing grub on '/dev/nvme0n1p1'
Jan 31 16:01:57 grub-installer: info: Running chroot /target grub-install  
--force "/dev/nvme0n1p1"
Jan 31 16:01:58 grub-installer: error: Running 'grub-install  --force 
"/dev/nvme0n1p1"' failed.

@Frank & Andrew
Has this been reproduced on our power machines with nvme drives?

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https://bugs.launchpad.net/bugs/1861655

Title:
  [Ubu 20.04][kernel-5.4.0-12-generic][WSP-DD2.3] Unable to install Ubu
  20.4 on NVMe disk

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