Ubuntu 19.10 after updating the "Other Software" tab in "Software & Updates" the "cache refresh" hangs

Running the command from a terminal window The following messages are logged when the hang occurs:

simon@Ubuntu-2600K:~$ sudo software-properties-gtk
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogCacheOutdated.py", line 86, in on_pktask_finish
    results = self._pktask.generic_finish(result)
gi.repository.GLib.Error: pk-client-error-quark: W: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://packages.microsoft.com/repos/vscode stable InRelease' doesn't support architecture 'i386'
E: The repository 'http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu eoan Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
 (319)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogCacheOutdated.py", line 89, in on_pktask_finish
    Gtk.ButtonsType.CANCEL, _("Error while refreshing cache"))
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 319, in new_init
    return super_init_func(self, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 575, in __init__
    self._init(*args, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 319, in new_init
    return super_init_func(self, **new_kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 521, in __init__
    _window_init(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 319, in new_init
    return super_init_func(self, **new_kwargs)
TypeError: could not convert value for property `transient_for' from DialogCacheOutdated to GtkWindow

I note similar issues reported for other functions however, these seem to have been resolved.