[Bug 1766945] Re: (EFI on top of legacy install) choosing "replace" or "resize" options in partitioning may lead to an install failure

[Jean-Baptiste Lallement]

** Changed in: ubiquity (Ubuntu)
   Importance: Undecided => Critical

** Changed in: partman-efi (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1766945

Title:
  (EFI on top of legacy install) choosing "replace" or "resize" options
  in partitioning may lead to an install failure

Status in partman-efi package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  If I have existing data on disk built by a previous version of Ubuntu
  (in BIOS (legacy) mode, or a previous Windows install, and no EFI
  system partition on disk; the installer presents three choices:

  - Replace $existing and reinstall.  (if a previous Ubuntu install was found)
  - Resize and install
  - Erase disk and install.

  The first two options will attempt to complete the installation in EFI
  mode (as they should) but do not create an EFI system partition, which
  is required as a place to put shim and grub on disk for booting. The
  installer will then crash / fail as grub-install fails to find the ESP
  when copying the bootloader.

  The last option works correctly, it creates the ESP as it erases the
  entire disks and proceeds with new partitioning.

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