[Bug 1979852] [NEW] live-cd install to flash drive renders NVME Ubuntu install unbootable

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I have Ubuntu 20.4.4 zfs installed on a NVME drive.  I was trying to use
the live-cd to install another copy of Ubuntu (full install) onto a
flash drive.  The installation went ahead successfully but when trying
to reboot it hung and I had to restart the computer after 30 minutes.
However, when I restarted the computer the installation on the NVME
drive was unbootable.

Apparently, the live-cd overwrote the grub configuration on the NVME drive. The only way to recover from this is to drop to the command line in grub and issue the the commands described on this web page:
https://askubuntu.com/questions/1225751/recovering-a-borked-grub-with-a-ubuntu-19-10-zfs-root-filesystem

Then run update-grub.

The evidence for this is the following two lines in the fstab on the flash drive.
/boot/efi was on /dev/nvme0n1p1 during installation
UUID=1887-580A  /boot/efi       vfat    umask=0022,fmask=0022,dmask=0022      0       1

The correction to fstab on the flash drive was the following:
# update to point to flash drive
UUID=91EF-3687  /boot/efi       vfat    umask=0022,fmask=0022,dmask=0022      0       1

Also this recovery procedure from the Grub command line would be easier
of grub could read zfs partition instead of saying it is a unknown file
system

Also,  there is no reason for the live-cd to access any other drive than
the one that it is installing on -- this is required for a safe
installation procedure.

Note: attached file contains configuration of my system after fstab on
the flash drive was fixed to point to correct drive.

Regards,
Bob Wheater

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment install procedure
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live-cd install to flash drive renders NVME Ubuntu install unbootable
https://bugs.launchpad.net/bugs/1979852
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