[Bug 1575092] Re: Reinstall of Ubuntu 16.04 over failed upgrade of Ubuntu (15.10 -> 16.04) results in grub installation failure

[Phillip Susi]

Your disk is currently partitioned to boot in bios mode, but you booted
the 16.04 installer in EFI mode. A warning message prompted you that
this could be a problem and recommended performing a bios mode install
instead, but you chose not to. You either need to perform the bios mode
install, or partition the disk using GPT and set up an EFI system
partition to install in EFI mode. This will be done for you if you
choose the "use entire disk" guided install option.

** Changed in: grub-installer (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1575092

Title:
  Reinstall of Ubuntu 16.04 over failed upgrade of Ubuntu (15.10 ->
  16.04) results in grub installation failure

Status in grub-installer package in Ubuntu:
  Invalid

Bug description:
  I had a working Ubuntu 15.10 installation (which itself was an upgrade
  from an earlier release). Got prompted if I wanted to upgrade to 16.04
  and answered yes. During the upgrade several dozen packages failed to
  install, many of them libraries. I was eventually left with a system
  that would not work so I decided to reinstall the OS, keeping existing
  user files intact (booting from USB). The install proceeded without
  problems but at the end I got the error message "The 'grub-efi-
  amd64-signed' package failed to install into / target/." Now I'm left
  with a computer without any working OS.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.63
  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: 1.376
  Date: Tue Apr 26 17:51:26 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --- cdrom-detect/try-usb=true noprompt
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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