I tried recreating this by moving my Ubuntu.mirrors file aside e.g.:
sudo mv /usr/share/python-apt/templates/Ubuntu.mirrors /tmp/
and that did not cause a crash but raised an error message saying to
check your Internet connection. Then after closing the mirror selection
dialog box I received the following Traceback.
WARNING: Failed to read mirror file
Traceback (most recent call last):
File
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
line 543, in on_combobox_server_changed
res = dialog.run()
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/DialogMirror.py",
line 272, in run
iter = model.get_iter(row)
File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 823, in
get_iter
path = self._coerce_path(path)
File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 798, in
_coerce_path
return TreePath(path)
File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 1146, in
__new__
path = ":".join(str(val) for val in path)
TypeError: 'NoneType' object is not iterable
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https://bugs.launchpad.net/bugs/1101881
Title:
software-properties-gtk crashed with TypeError in __new__(): object of
type 'NoneType' has no len()
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