[Bug 1923553] Re: software-properties gui python exception on selecting "other" package source

[elguavas]

*** This bug is a duplicate of bug 1909918 ***
    https://bugs.launchpad.net/bugs/1909918

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.

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

Title:
  software-properties gui 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. 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.

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