Public bug reported:

The installer crashed after complaining that grub could not be

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

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 [modified: 
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)
 PATH=(custom, no user)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug ubiquity- ubuntu xenial

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

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