[Bug 1396379] Re: installer uses first EFI system partition found even when directed otherwise

[Chris Guiver]

@Imamul Islam (mii-1989)

Ubuntu 23.04 DESKTOP is expected to have 2x ISOs, the primary using the
new desktop installer, the secondary ISO using the legacy ubiquity
installer.  You can see that in the iso.qa.ubuntu.com lunar site
(http://iso.qa.ubuntu.com/qatracker/milestones/441/builds where the
LEGACY testcase will point to a different ISO)

Even if the primary ISO is not impacted; the legacy/ISO installer will
likely still be impacted.

Note:  I've had little experience with this issue; the only time I could
re-create it was when I wrote the ISO to thumb-drive in specific ways &
thus was impacted it... ie. a user can trigger this bug report via using
specific ISO writes rather than the documented ISO procedures..  I don't
doubt real users experienced it using the documented ISO write
procedures; but I could not re-create it on the hardware I have access
to.

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Title:
  installer uses first EFI system partition found even when directed
  otherwise

Status in grub-efi-amd64-signed package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed
Status in grub-efi-amd64-signed source package in Jammy:
  Confirmed
Status in ubiquity source package in Jammy:
  Confirmed

Bug description:
  (k)ubuntu 14.04.1
  package version: 2.02~beta2-9ubuntu1

  i installed ubuntu on my external hard disk, where i also have a previously installed fedora system. i also have a windows
  (efi-booted) system in the internal hard disk.

  at install time via ubiquity i get all grub configuration files in the first EFI-labelled partition (i.e. /dev/sda2 in my case) instead of the one i selected (/dev/sdb1).
  later i changed my fstab mounting /boot/efi on /dev/sdb1 and tried to reinstall grub package (apt-get install --reinstall grub-efi-amd64); now all grub configuration files are in the rigt place, but booting from the external hard disk still shows the fedora grub installation, while selectin the internal hard disk from the bios menu shows a submenu listing ubuntu and windows.
  explicitly installing grub in the correct disk (grub-install /dev/sdb; grub-mkconfig -o /boot/efi/EFI/ubuntu/grub.cfg) has no effect, nor it has running efibootmgr (efibootmgr -c --disk /dev/sdb --part 1).

  expected results: grub shoud have been installed in the disk/partition i chose;
  actual results: ubuntu always chooses the first disk to install grub on.

  Note that this is not just about the dummy grub install location
  selector that is not used in EFI mode, but configuring one partition
  as do not use, and the other as ESP in the manual partitioning screen.

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