Comment 2 for bug 1994502

Excerpt from installer/debug:

Exception in GTK frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/base.py", line 473, in check_returncode
    self.set_online_state(state)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 586, in set_online_state
    p.ui.plugin_set_online_state(state)
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 55, in plugin_set_online_state
    self.enable_download_updates(state)
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 190, in enable_download_updates
    self.label_download_updates.set_label(
TypeError: Argument 1 does not allow None as a value

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/base.py", line 473, in check_returncode
    self.set_online_state(state)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 586, in set_online_state
    p.ui.plugin_set_online_state(state)
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 55, in plugin_set_online_state
    self.enable_download_updates(state)
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 190, in enable_download_updates
    self.label_download_updates.set_label(
TypeError: Argument 1 does not allow None as a value