[Bug 1679784] Re: Changing from Xorg video driver to NVIDIA driver using Software & Updates does not display debconf prompt

[Steve Langasek]

Per bdmurray's guidance, I have also now tested through update-manager,
by unselecting those packages not needed to be upgraded to test this,
and confirmed that I get the right result this way also. (Selecting
software-properties-gtk for installation is sufficient for update-
manager to automatically resolve the dependencies on libgtk2-perl and
friends.)

** Tags removed: verification-needed
** Tags added: verification-done-yakkety

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Title:
  Changing from Xorg video driver to NVIDIA driver using Software &
  Updates does not display debconf prompt

Status in software-properties package in Ubuntu:
  Fix Released
Status in software-properties source package in Trusty:
  Confirmed
Status in software-properties source package in Xenial:
  Confirmed
Status in software-properties source package in Yakkety:
  Fix Committed

Bug description:
  [SRU Justification]
  software-properties does not display debconf prompts. while most debconf prompts have default answers and this is fine, for installing dkms modules on a SecureBoot-capable system we specifically have a critical debconf prompt with no possible default answer that users need to step through in order for their dkms modules to be usable.

  [Test case]
  1. sudo apt-add-repository ppa:vorlon/debconf-tests
  2. sudo apt update
  3. Launch Settings -> Software & Updates -> Additional Drivers
  4. Confirm that you are offered the option of using the 'noisy-fake-driver' package.
  5. Select this driver and apply changes.
  6. Confirm that no debconf prompt is shown, and the driver package fails to install ('dpkg -l noisy-fake-driver' shows 'iF').
  7. Reset the package state by removing the driver again.
  8. Enable -proposed.
  9. Run update-manager and verify that the new software-properties package is successfully installed from -proposed, pulling in libgtk2-perl in the process.
  10. Close Software & Updates and re-launch it.
  11. Select the 'noisy-fake-driver' package again.
  12. Confirm that you are shown a debconf prompt, and the driver package installs successfully.

  [Regression potential]
  The actual code change is small and self-contained, but the fix also requires pulling in new package dependencies which will also need to be promoted from universe to main in the process.  We need to take extra care to ensure the upgrade path is correct.  This SRU should also be done serially one release at a time to gather feedback at each stage.

  [Original bug description]
  I've encountered this repeatedly.

  In the first installation -- on updating via Software Updater, this
  crashed on upgrading the shim-signed package.

  On suggestions from here:

  I upgrade the system via CLI, i.e. dist-upgrade. This seemed to work,
  however when I now try to swap the display driver, from xorg -->
  nvidia. This now triggered the same issue.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: shim-signed 1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
  Uname: Linux 4.4.0-72-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Tue Apr  4 18:21:32 2017
  DuplicateSignature:
   package:shim-signed:1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
   Processing triggers for shim-signed (1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
   Running in non-interactive mode, doing nothing.
   dpkg: error processing package shim-signed (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2017-04-04 (0 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.19
  SourcePackage: shim-signed
  Title: package shim-signed 1.27~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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