[Bug 1639374] Re: grub-pc fails to remove, rendering lubuntu uninstallable on EFI machines

[didier]

One should check if BIOS is configured with legacy or UEFI mode.

- 64 bits package imposes UEFI installation even if the BIOS is in Legacy mode so incoherence in the end (next reboot).
- 32 bit package can be performed in Legacy mode (maybe why 168422 can be performed ?).

More explicit warning messages should be displayed in the installation
process. Test of BIOS config not possible ?

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https://bugs.launchpad.net/bugs/1639374

Title:
  grub-pc fails to remove, rendering lubuntu uninstallable on EFI
  machines

Status in grub2 package in Ubuntu:
  Invalid
Status in lubuntu-meta package in Ubuntu:
  Won't Fix

Bug description:
  Crashed during install

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: ubiquity 16.10.14
  ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
  Uname: Linux 4.8.0-22-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CasperVersion: 1.379
  Date: Fri Nov  4 18:31:30 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/lubuntu.seed cdrom-detect/try-usb=true persistent noprompt floppy.allowed_drive_mask=0 ignore_uuid boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Lubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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