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

[Simos Xenitellis]

I am installing Ubuntu 15.10 (final) and I encountered this issue (exactly as described by the original poster).
This issue is mentioned in https://wiki.ubuntu.com/WilyWerewolf/ReleaseNotes as well, in the Known Issues section.

However, in my case the Force UEFI dialog cannot be closed, thus, it is
not possible to continue the installation.

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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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