[Bug 1623348] [NEW] Unable to install Ubuntu 16.04 from USB drive

[Jon]

Public bug reported:

I was unable to install Ubuntu 16.04 on a separate partition from a USB
drive. During the installation process, the installer was unable to
resolve a problem with the bootloader.

Currently using 15.10

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 i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
CasperVersion: 1.376
Date: Wed Sep 14 00:00:24 2016
InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release i386 (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)

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


** Tags: apport-bug i386 ubiquity-2.21.63.2 ubuntu xenial

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https://bugs.launchpad.net/bugs/1623348

Title:
  Unable to install Ubuntu 16.04 from USB drive

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I was unable to install Ubuntu 16.04 on a separate partition from a
  USB drive. During the installation process, the installer was unable
  to resolve a problem with the bootloader.

  Currently using 15.10

  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 i686
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  CasperVersion: 1.376
  Date: Wed Sep 14 00:00:24 2016
  InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
  LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release i386 (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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