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

[Steve Langasek]

** Description changed:

+ [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.
+ 7. Enable -proposed.
+ 8. Run update-manager and verify that the new software-properties package is successfully installed from -proposed, pulling in libgtk2-perl in the process.
+ 9. Close Software & Updates and re-launch it.
+ 10. Select the 'noisy-fake-driver' package again.
+ 11. Confirm that you are shown a debconf prompt, and the driver package installs successfully.
+ 
  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
+  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
+  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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https://bugs.launchpad.net/bugs/1679784

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.
  7. Enable -proposed.
  8. Run update-manager and verify that the new software-properties package is successfully installed from -proposed, pulling in libgtk2-perl in the process.
  9. Close Software & Updates and re-launch it.
  10. Select the 'noisy-fake-driver' package again.
  11. Confirm that you are shown a debconf prompt, and the driver package installs successfully.

  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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