[Bug 1668148] Re: Booting installer in EFI mode with existing bios mode hd crashes

[Chris Chambers]

I have this problem to and my setup is a bit different and i do not see
a similar setup mentioned here.

My disc is GPT partitioned, UEFI is disabled and i boot/install in BIOS
mode but Ubuntu (Lubuntu) is the only OS installed. That is because off
a BCM4312 wireless chip which i need compile a module for, no binary
available.  Short off getting that compiled driver signed i must disable
UEFI and use BIOS mode.

Disc is partitioned; / , swap , /home , no bios-grub or EFI partition.

Four attempts to install 18.04 all failed. Problem as noted above.
Installed 16.04 no problem other than install media does boot as UEFI
and the messages 16.04 installer gives are a bit succinct! but going
back one stage does fix and install works good.

During the 18.04 install attempts NO warning messages received.

Best Wishes Chris

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https://bugs.launchpad.net/bugs/1668148

Title:
  Booting installer in EFI mode with existing bios mode hd crashes

Status in partman-efi package in Ubuntu:
  Triaged
Status in partman-efi source package in Artful:
  Triaged

Bug description:
  When installing in EFI mode to a disk that is partitioned without an
  EFI system partition, you do get a warning message that this may cause
  a problem and suggests that you go back and do a bios mode install
  instead.  The way that it is worded, and the fact that the button to
  switch to a BIOS mode install is labeled "cancel", is very confusing
  and has lead to hundreds, if not thousands of users clicking the OK
  button instead, and proceeding with an install that is doomed to fail.
  This message really needs to be clarified.

  Instead of clarifying, the question was removed, and grub-efi is
  always used, which crashes the install.  grub-pc is the correct
  version to use in this case.  This is a release regression that needs
  corrected for 18.04.1.

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