[Bug 1779599] [NEW] Installation to USB HD (/dev/sdb) crashed on GRUB install failure

[Deryk Durrant]

Public bug reported:

GRUB EFI failed trying to install the x64 signed package - this error
appeared to be handled correctly by the routine (error was shown in
warning dialogue and OK button returned control to installer). However
this was immediately followed by a fatal (unknown) error which resulted
in the bug check.

Background
Booted EFI to Live USB Ubuntu 18.04 on system with HDD and external unpartitioned HDD. Ran auto-install routine, but chose to partition external HDD manually. Error received after acknowledging GRUB installation error dialogue.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Mon Jul  2 05:44:00 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic ubiquity-18.04.14 ubuntu

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https://bugs.launchpad.net/bugs/1779599

Title:
  Installation to USB HD (/dev/sdb) crashed on GRUB install failure

Status in grub-installer package in Ubuntu:
  New

Bug description:
  GRUB EFI failed trying to install the x64 signed package - this error
  appeared to be handled correctly by the routine (error was shown in
  warning dialogue and OK button returned control to installer). However
  this was immediately followed by a fatal (unknown) error which
  resulted in the bug check.

  Background
  Booted EFI to Live USB Ubuntu 18.04 on system with HDD and external unpartitioned HDD. Ran auto-install routine, but chose to partition external HDD manually. Error received after acknowledging GRUB installation error dialogue.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.394
  Date: Mon Jul  2 05:44:00 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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