Is there any way to get widevine running on 21.10? I've tried using the method here: https://github.com/monkaBlyat/docker-chromium-armhf
Which worked on 20.04, however it doesn't seem to work on 21.10, as it just ends with this:
I'm no Docker guru, or a Raspberry Pi guru, by any stretch. But let me chip in: Try rebooting. If you did an apt-get upgrade right before trying to use the Docker container of Chromium, and the upgrade installed a new kernel, the proper kernel modules will not be loaded since the operating system will be stuck in a somewhat inconsistent state.
You can find out more at https://github.com/moby/moby/issues/27426.
I did end up flashing an older kernel due to the audio being broken on the latest version. That could have something to do with it perhaps?
Yeah, I think so. Again, reboot after a kernel update, and if that fixed the problem, then bam, there we go. 
To get Widevine support for Chromium browser running on Raspberry Pi OS, update the software sources, update your system, then install libwidevinecdm0:
sudo apt update
sudo apt full-upgrade
sudo apt install libwidevinecdm0
Restart your Chromium web browser in case it was running, and that's it.
