Ubiquity 17.04.7
/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:53: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk, GObject, GLib, Atk

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:23:18: not a number

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:23:18: Expected a string.

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:815:10: not a number

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:815:24: Using Pango syntax for the font: style property is deprecated; please use CSS syntax

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1953:14: not a number

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1953:14: Expected a string.

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: nautilus.css:50:71: Using one color stop with linear-gradient() is deprecated.

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: nautilus.css:51:71: Using one color stop with linear-gradient() is deprecated.

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-lubuntu.css:252:14: not a number

(ubiquity:1674): Gtk-WARNING **: Theme parsing error: gtk-lubuntu.css:252:14: Expected a string.
/usr/lib/ubiquity/plugins/ubi-timezone.py:195: PyGIWarning: TimezoneMap was imported without specifying a version first. Use gi.require_version('TimezoneMap', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import TimezoneMap
No such schema “org.gnome.nautilus.desktop”
/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:18: Warning: Source ID 88 was not found when attempting to remove it
  GLib.source_remove(self.timeout_id)
update_release_notes_label()
Could not translate page (prepare): 'NoneType' object has no attribute 'replace'
/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:18: Warning: Source ID 141 was not found when attempting to remove it
  GLib.source_remove(self.timeout_id)
Exception in GTK frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1497, in on_next_clicked
    if ui.plugin_on_next_clicked():
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 163, in plugin_on_next_clicked
    self.nmwidget.connect_to_ap()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 333, in connect_to_ap
    self.view.connect_to_selection(passphrase)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 249, in connect_to_selection
    ssid = model[iterator][0]
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 801, in __getitem__
    aiter = self._getiter(key)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 789, in _getiter
    aiter = self.get_iter(key)
  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 1157, in __new__
    path = ":".join(str(val) for val in path)
TypeError: 'NoneType' object is not iterable

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1497, in on_next_clicked
    if ui.plugin_on_next_clicked():
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 163, in plugin_on_next_clicked
    self.nmwidget.connect_to_ap()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 333, in connect_to_ap
    self.view.connect_to_selection(passphrase)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 249, in connect_to_selection
    ssid = model[iterator][0]
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 801, in __getitem__
    aiter = self._getiter(key)
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 789, in _getiter
    aiter = self.get_iter(key)
  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 1157, in __new__
    path = ":".join(str(val) for val in path)
TypeError: 'NoneType' object is not iterable