[Bug 1923553] [NEW] software-properties-qt python exception on selecting "other" package source

[elguavas]

Public bug reported:

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.

this python traceback appears in the console:

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'

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.

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1923553

Title:
  software-properties-qt python exception on selecting "other" package
  source

Status in software-properties package in Ubuntu:
  New

Bug description:
  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.

  this python traceback appears in the console:

  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'

  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.

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