Comment 39 for bug 1396379

Easiest workaround is to use gparted or similar to remove the EFI/boot flag
on existing EFI partitions before the install.

On Sun, 10 May 2020 at 19:55, Christian Nassau <email address hidden>
wrote:

> I think I have just been hit by that bug too: fresh install of (X)Ubuntu
> 20.04 on a new computer with a new SSD, which also happened to have an
> old HDD with an existing EFI boot paritition. I chose the "expert"
> option for the partitioning dialog in install and explicitly specified
> the new SSD as the intended boot device. The install used the existing
> EFI on the old HDD instead.
>
> Recovering was not easy (with hindsight there might have been better
> options): I physically removed (!) the HDD, installed a 2nd copy of
> Ubuntu 20.04 on a new separate partition on the SSD, again in "expert
> mode". During installation I was warned that there was no EFI partition
> and the system would be unusable, so I manually created an EFI partition
> for /boot/efi on the SSD. I then replaced the relevant lines in
> /etc/fstab of the first attempt with the correct ones from the 2nd.
> After a succesful reboot into the fixed system I added the old HDD again
> and manually ran "apt-get --reinstall install grub-common os-prober
> grub-efi-amd64" to rescan the HDD for extra grub entries.
>
> To prevent others from running into this problem it would make sense to
> add another warning to the "expert" install process: there already is a
> check for the existence of at least one EFI partition in the system -
> this check should also warn if the EFI partition is not on the device
> that the user has explicitly selected for the boot loader.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1396379
>
> Title:
> installer uses first EFI system partition found even when directed
> otherwise
>
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>

--
Tim Richardson