[Bug 1706013] [NEW] Ubiquity crashes after failing to install Grub to /target

[n.st]

Public bug reported:

Tried to install Xubuntu 16.04.2 to a USB harddisk from the desktop ISO.
Installer reported an error about being unable to install Grub to /target (no problem there, I can do that myself), but then crashed completely (without any further error messages) and launched the error reporting tool.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.3 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CasperVersion: 1.376.2
Date: Mon Jul 24 11:39:10 2017
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
ProcEnviron:
 LANGUAGE=de_DE.UTF-8
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug ubiquity-2.21.63.3 xenial xubuntu

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https://bugs.launchpad.net/bugs/1706013

Title:
  Ubiquity crashes after failing to install Grub to /target

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Tried to install Xubuntu 16.04.2 to a USB harddisk from the desktop ISO.
  Installer reported an error about being unable to install Grub to /target (no problem there, I can do that myself), but then crashed completely (without any further error messages) and launched the error reporting tool.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.63.3 [modified: lib/partman/automatically_partition/question]
  ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
  Uname: Linux 4.8.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CasperVersion: 1.376.2
  Date: Mon Jul 24 11:39:10 2017
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
  ProcEnviron:
   LANGUAGE=de_DE.UTF-8
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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