[Bug 1783996] Re: [efi on top of legacy] Show a warning that installation will fail if user doesn't create an ESP partition or fallback to grub-pc

[Brian Murray]

** Changed in: grub-installer (Ubuntu Cosmic)
   Importance: Critical => High

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https://bugs.launchpad.net/bugs/1783996

Title:
  [efi on top of legacy] Show a warning that installation will fail if
  user doesn't create an ESP partition or fallback to grub-pc

Status in grub-installer package in Ubuntu:
  Confirmed
Status in grub-installer source package in Cosmic:
  Confirmed

Bug description:
  Test Case:
  1. On a EFI machine with an existing system installed in BIOS mode (without an ESP partition), boot 18.04.1 (in EFI mode)
  2. Select manual partitioning
  3. Resize the main partition
  4. Allocate the free space to Ubuntu and do not create an ESP partition
  5. Proceed with the installation

  Result
  Grub setup and installation fail.

  Given it'll always fail the installer should either display a warning
  (same message than when a new partition table is created in manual
  partitioning mode and an ESP partition is not created) or completely
  forbid the type of setup and prevent the user from confirming the new
  partitioning scheme if he didn't create an ESP partition.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14.6 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CasperVersion: 1.394
  Date: Fri Jul 27 08:57:31 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper ---
  LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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