Latest Ubuntu update broke everything

Bluetooth not working at all, internet not working at all, and even the setting for HDMI audio output is gone. The settings page is just empty.

I managed to load an older kernel(?) and got Bluetooth and internet working again, but still no audio. I'm as much of a novice at running Linux as you can get. I've been trying to troubleshoot this with the help of an LLM, but I have no idea what I'm doing here.

Any help, please?