Can't get into keyboard settings

Distribution

Linux Mint 22.1

Package version

Cinnamon 6.4.8

Graphics hardware in use

NVIDIA Corporation AD107 [GeForce RTX 4060] (rev a1)

Frequency

Always

Bug description

I have problem mostly identical to https://forums.linuxmint.com/viewtopic.php?t=431089
The keyboard settings window does not open.

When invoke keyboard settings i got
Using PAM module (python3-pam) Loading Keyboard module Traceback (most recent call last): File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 751, in button_press self.side_view_nav(widget, None, category) File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 176, in side_view_nav self.go_to_sidepage(sidePage, user_action=True) File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 185, in go_to_sidepage sidePage.build() File "/usr/share/cinnamon/cinnamon-settings/bin/SettingsWidgets.py", line 212, in build self.module.on_module_selected() File "/usr/share/cinnamon/cinnamon-settings/modules/cs_keyboard.py", line 513, in on_module_selected _config = json.load(config_file) ^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/json/__init__.py", line 293, in load return loads(fp.read(), ^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/json/__init__.py", line 346, in loads return _default_decoder.decode(s) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/json/decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/json/decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Steps to reproduce

Open the system settings and click on the keyboard settings.

Expected behavior

The keyboard settings window should open.

Additional information

The system is old, it was successively updated mint 20->21->22
The system language is Russian.
There are no other obvious problems at the moment.

Start with cinnamon-settings/modules/cs_keyboard.py at on_module_selected and the cinnamon-settings.py traceback, then reproduce by opening Keyboard settings. Trace which config_file is loaded and verify that Keyboard settings opens successfully for the reported setup, including the Russian locale and upgraded system state.