software-properties gui python exception on selecting "other" package source

[elguavas]

on hirsute (21.04) software-properties-qt (software-properties-qt/hirsute 0.99.8) (also callable as software-properties-kde) throws a python exception when a package download source of "other" is selected. the same underlying error occurs when using software-properties-gtk (software-properties-gtk/hirsute 0.99.8).

this python traceback appears in the console for the qt gui:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 454, in on_combobox_server_changed
    dialogue = DialogMirror(self.userinterface, self.datadir, self.distro, self.custom_mirrors)
  File "/usr/lib/python3/dist-packages/softwareproperties/qt/DialogMirror.py", line 55, 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'

and this appears for the gtk gui:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 661, in on_combobox_server_changed
    dialog = DialogMirror(self.window_main,
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogMirror.py", line 85, 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'

i assume the underlying python code being called is using the long deprecated and now removed "getiterator" method in ElementTree to generate the list of "other" download sources.

[elguavas (elguavas.)]

yes bug #1909918 mentions the same issue, but my report has a little more info on what the underlying python problem is and also mentions that it occurs in all the various software-properties gui's, not just software-properties-gtk as is stated in the the other bug report.

[elguavas (elguavas.)]

updated bug #1909918 with the extra info.