[Bug 1839501] Re: Can't Switch between Nvidia Drivers because of error in SoftwarePropertiesQt.py

[Brian Murray]

It's actually because the "get_dependencies" function is not defined in
SoftwarePropertiesQt.py and is not imported.

softwareproperties/gtk/SoftwarePropertiesGtk.py:def get_dependencies(apt_cache, package_name, pattern=None):
softwareproperties/gtk/SoftwarePropertiesGtk.py:                    for dep in get_dependencies(self.apt_cache, pkg.shortname, 'nvidia'):
softwareproperties/qt/SoftwarePropertiesQt.py:            for dep in get_dependencies(self.apt_cache, pkg.shortname, 'nvidia'):


** Tags added: eoan

** Changed in: software-properties (Ubuntu)
   Importance: Undecided => High

** Changed in: software-properties (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1839501

Title:
  Can't Switch between Nvidia Drivers because of error in
  SoftwarePropertiesQt.py

Status in software-properties package in Ubuntu:
  Triaged

Bug description:
  Hardware: Dell Latitude E6430 with GF108GLM [NVS 5200m]

  Lubuntu 19.04
  LBS Release: Description:    Ubuntu 19.04
  software-properties-qt:
    Installed: 0.97.11
    Candidate: 0.97.11
    Version table:
   *** 0.97.11 500
          500 http://us.archive.ubuntu.com/ubuntu disco/universe amd64 Packages
          100 /var/lib/dpkg/status

  I ran "Additional Drivers" from the menu and switched from Nouveau to the nvidia-driver-418 to see how it ran. 
  After testing for a couple days I tried to switch back.
  When I select Nouveau and click "Apply changes" nothing happens. 

  I ran software-properties-qt from the command line and get this error
  when I click "Apply Changes".

  #lxsudo /usr/bin/software-properties-qt '--open-tab=4'
   (0x7ffda7818770) Warning: Icon theme "breeze" not found.

  QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 845, in on_driver_changes_apply
      for dep in get_dependencies(self.apt_cache, pkg.shortname, 'nvidia'):
  NameError: name 'get_dependencies' is not defined

  
  I searched through the source and I'm guessing it's the extra parameter 'nvidia' at the end that's causing the issue, since there's no 3 parameter function definition for get_dependencies.

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