If you can't find /usr/lib/python3/site-packages/, then you should have /usr/lib/python3/dist-packages/ instead. lệnh phải sửa thành :
sudo -H gedit /usr/lib/python3/dist-packages/UnityTweakTool/section/system.py
sudo -H gedit /usr/lib/python3/dist-packages/UnityTweakTool/section/spaghetti/gsettings.py