[Bug 1872551] [NEW] kubuntu-driver-manager: nvidia driver version switch fails

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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)

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal
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kubuntu-driver-manager: nvidia driver version switch fails
https://bugs.launchpad.net/bugs/1872551
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