Dear Maintainer,

   * What led up to the situation?

Attempting to change download location using the "other" option in the
"download from" drop-down menu. This was attempted by opening software-
properties-gtk in a terminal and, alternatively, using Synaptic:
Settings>Repositories.

   * What was the outcome of this action?

Terminal output is the following:

1) When opening software-properties-gtk:

ERROR:root:Cannot import UbuntuDrivers: No module named 'UbuntuDrivers'

(software-properties-gtk:): Gtk-WARNING **: : Could not load a pixbuf from
/org/gtk/libgtk/theme/Adwaita/assets/check-symbolic.svg.
This may indicate that pixbuf loaders or the mime database could not be found.

2) When selecting "other" option in the "download from" drop-down menu:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-
packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 553, in
on_combobox_server_changed
    dialog = DialogMirror(self.window_main,
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogMirror.py",
line 83, in __init__
    self.country_info = CountryInformation()
  File "/usr/lib/python3/dist-
packages/softwareproperties/CountryInformation.py", line 34, in __init__
    it = et.getiterator('iso_3166_entry')
AttributeError: 'ElementTree' object has no attribute 'getiterator'


   * What outcome did you expect instead?

When selecting "other" under the "download from" drop-down menu, software-
properties-gtk should open a pop-up menu displaying download locations
available.