[Bug 1572754] Re: 16.04 installer failed during grub-install with error: attempt to install to encrypted disk without cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file `/etc/default/grub'

[TJ]

Having looked more closely this bug was a result of user error; I did in
fact repartition the installation device and had a separate partition
for /boot/ which was also LUKS/dm_crypt. I had forgotten I needed to
edit  the /target/etc/default/grub whilst ubiquity was installing GRUB,
and had to do it manually after ubiquity had completed.

This bug is about ubiquity actually *crashing* due to the package
install failure rather than doing a clean error report and user-
controlled quit.

For that reason I'm re-titling the bug so as not to distract from this
bug reason with the mention of the GRUB_ENABLE_CRYPTODISK.


** Summary changed:

- 16.04 installer failed during grub-install with error: attempt to install to encrypted disk without cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file `/etc/default/grub'
+ 16.04 ubiquity crashed due to package-install failure of grub2 during grub-install step

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https://bugs.launchpad.net/bugs/1572754

Title:
  16.04 ubiquity crashed due to package-install failure of grub2 during
  grub-install step

Status in grub-installer package in Ubuntu:
  Confirmed

Bug description:
  No idea why ubiquity crashed; maybe post mortem will reveal something.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.60 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.375
  Date: Wed Apr 20 22:49:10 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160419)
  ProcEnviron:
   LANGUAGE=en_GB.UTF-8
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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