Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreApplication.py", line 2712, in on_delete_cb
    delete_func(self.treeview, model, treeiter)
  File "/usr/lib/python3/dist-packages/menulibre/MenulibreApplication.py", line 2536, in delete_launcher
    os.remove(filename)
PermissionError: [Errno 13] Permission denied: '/usr/share/applications/calendar.desktop'