could you test adding this to /lib/python3/dist-
packages/softwareproperties/qt/SoftwarePropertiesQt.py
SoftwarePropertiesQt.py ? For me testing with nvidia is not easy

--- /lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py    
2020-04-14 09:16:19.370592334 -0400
+++ SoftwarePropertiesQt.py     2020-04-14 09:02:21.894527421 -0400
@@ -78,6 +78,17 @@
       QWidget.__init__(self)
       uic.loadUi("%s/designer/main.ui" % datadir, self)
 
+def get_dependencies(apt_cache, package_name, pattern=None):
+    """ Get the package dependencies, which can be filtered out by a pattern 
"""
+    dependencies = []
+    for or_group in apt_cache[package_name].candidate.dependencies:
+        for dep in or_group:
+            if dep.rawtype in ["Depends", "PreDepends"]:
+                dependencies.append(dep.name)
+    if pattern:
+        dependencies = [ x for x in dependencies if x.find(pattern) != -1 ]
+    return dependencies
+
 class SoftwarePropertiesQt(SoftwareProperties):
   def __init__(self, datadir=None, options=None, parent=None, file=None, 
attachWinID=None):
     """ Provide a Qt-based graphical user interface to configure

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

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

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