[Bug 1418706] Re: UEFI: blank drive incorrectly detected as existing BIOS-mode install

[Huan Zhang]

This problem still occurs in Ubuntu 17.04 installer.
If internet is connected before installation and using a blank disk, the "Force UEFI installation" box will pop up after a manual partition. The buttons ("Go Back" and "Continue") on the box do not work, and installation gets stuck here.
Reproducible on multiple machines. Have to disconnect Internet before running the installer.

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https://bugs.launchpad.net/bugs/1418706

Title:
  UEFI: blank drive incorrectly detected as existing BIOS-mode install

Status in partman-auto package in Ubuntu:
  Triaged
Status in partman-efi package in Ubuntu:
  Triaged
Status in ubiquity package in Ubuntu:
  Triaged
Status in partman-auto package in Debian:
  New

Bug description:
  When doing a UEFI-mode install using the latest daily Vivid ISO (Thu
  Feb 5), Ubiquity incorrectly concludes that a blank drive contains an
  existing BIOS-mode install (see error in attached screenshot).

  The resulting error dialog is also broken: none of the buttons do any
  thing when clicked: X (close button), "Go Back", "Continue".

  You can seemingly move the install forward by clicking "Continue" in
  the main installer window, but things are still broken somewhere as
  grub isn't getting correctly installed (system is unbootable after the
  install completes).

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