[Bug 1872551] Re: software-properties-qt: nvidia driver version switch fails

[Rik Mills]

A fix for this has been uploaded. It is currently stuck in proposed
pocket due to an unrelated test failure of a reverse dependency, but I
anticipate that being sorted before 20.04 release.

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https://bugs.launchpad.net/bugs/1872551

Title:
  software-properties-qt: nvidia driver version switch fails

Status in software-properties package in Ubuntu:
  Fix Committed

Bug description:
  Switching the Nvidia driver version with kubuntu-driver-manager
  doesn't work anymore: Selecting a different driver version (nvidia-
  driver-440 instead of the currently selected / installed -390) and
  clicking "Apply Changes" has no effect and produces this error message
  in the terminal:

    Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 895, in on_driver_changes_apply
      for dep in get_dependencies(self.apt_cache, pkg.shortname, 'nvidia'):
  NameError: name 'get_dependencies' is not defined

  Steps to reproduce:
  - sudo kubuntu-driver-manager
  - Under "Additional Drivers", select a different Nvidia driver version
    (in my case: 440 instead of 390)
  - Click "Apply Changes"
  - (observe error message in the terminal)

  Expected result:
  - No error message
  - Nvidia driver version 440 gets installed

  Actual result:
  - Error message
  - No change in the installed Nvidia driver version

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: kubuntu-driver-manager (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Mon Apr 13 23:41:56 2020
  InstallationDate: Installed on 2016-11-26 (1234 days ago)
  InstallationMedia: Kubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
  SourcePackage: kubuntu-driver-manager
  UpgradeStatus: Upgraded to focal on 2020-03-06 (38 days ago)

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