[Bug 1646576] Re: Upgrading from 14.04 to 16.04 fails when recovering from `apt-get purge upstart`

[Phillip Susi]

Your disk is currently partitioned to boot in bios mode, but you booted
the 16.04 installer in EFI mode. A warning message prompted you that
this could be a problem and recommended performing a bios mode install
instead, but you chose not to. You either need to perform the bios mode
install, or partition the disk using GPT and set up an EFI system
partition to install in EFI mode. This will be done for you if you
choose the "use entire disk" guided install option.

** Changed in: grub-installer (Ubuntu)
       Status: New => Invalid

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Title:
  Upgrading from 14.04 to 16.04 fails when recovering from `apt-get
  purge upstart`

Status in grub-installer package in Ubuntu:
  Invalid

Bug description:
  The installer crashed after complaining that grub could not be
  installed.

  On the system I was trying to upgrade, a user had abused their "sudo
  for apt-get only" privileges to run sudo apt-get purge upstart, so the
  computer had no /sbin/init, and would kernel panic on boot.

  Since this was a 14.04 machine, I decided to use this as an
  opportunity to upgrade to 16.04. I tried to use the "upgrade from
  14.04 to 16.04" button in the installer, and got this error.

  Normally, I wouldn't expect the installer to work in such exceptional
  circumstances anyways, but after trying to rerun the installer to
  perform a clean install, it reached the same step and failed again.

  The exact message is:

  The 'grub-efi-amd64-signed' package failed to install into /target/.
  Without the GRUB boot loader, the installed system will not boot.

  In the terminal log attached to the installer window, a message
  something like "INFO: apt-get install grub-[something] failed" is
  present.

  After clicking OK in the error window, the installer freezes up, then
  presents me a window with title "Installer crashed" and the message:

  We're sorry; the installer crashed. After you close this window, we'll
  allow you to file a bug report using the integrated bug reporting
  tool. This will gather information about your system and your
  installation process. The details will be sent to our bug tracker and
  a developer will attend to the problem as soon as possible.

  I'll be rebooting now to see if the installer magically works after a
  reboot and to verify the integrity of my installation media.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.63.2 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CasperVersion: 1.376
  Date: Thu Dec  1 10:34:32 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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