[Bug 1447256] Re: "Force UEFI" dialog displayed if user selects custom partitioning

[Rod Smith]

I've confirmed Simos's observation. I've identified two variants of the
problem, doing a test installation under VirtualBox:

1) The disk is unpartitioned (either with no partition table or with a GPT in which no partitions are defined) when ubiquity is launched. In this case, the error message appears AFTER the manual partitioning screen. Importantly, it does not appear to be possible to continue past this error in this case; both the "Continue" and "Go back" buttons are unresponsive. Thus, the claim in the release notes that this bug "is harmless since... you can proceed with the installation" is flat-out wrong.
2) The disk contains at least one partition when ubiquity is launched. (I tested with a single partition flagged as an ESP, but holding no filesystem.) In this case, the error appears BEFORE the manual partitioning screen, and the "Continue" button works. (I didn't test the "Go back" button.) In this case, the error is confusing but is not nearly so important.

Because there seems to be no way out in the first case except to
terminate ubiquity (by rebooting or using command-line tools to kill the
process), and because the only fix is the (non-obvious) workaround of
creating a partition table and at least one partition, I consider this
bug to be serious.

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https://bugs.launchpad.net/bugs/1447256

Title:
  "Force UEFI" dialog displayed if user selects custom partitioning

Status in One Hundred Papercuts:
  Confirmed
Status in Release Notes for Ubuntu:
  Fix Released
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  vivid desktop amd64 20150422

  During installation on a blank disk on a UEFI system, if the user
  creates a custom partition, the installer displays the 'Force UEFI'
  dialog (screenshot) while there is no pre-installed system. This
  dialog is not displayed if the custom partitioner is not used.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubiquity 2.21.25
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.360
  Date: Wed Apr 22 13:00:04 2015
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcEnviron:
   SHELL=/bin/bash
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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