File "/usr/lib/python3/dist-packages/electrum/gui/qt/main_window.py", line 1158, in <lambda>
    receive_tabs.currentChanged.connect(lambda i: self.config.set_key('receive_tabs_index', i))
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 160, in set_key
    self._set_key_in_user_config(key, value, save)
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 169, in _set_key_in_user_config
    self.save_user_config()
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 261, in save_user_config
    with open(path, "w", encoding='utf-8') as f: