Bpfilter fail, read error

When I shut down or restart I have suddenly been getting loads of lines saying 'bpfiler fail, read error'. Any clues what this means and how to stop it?

It is not a harmful error, just a warning.
It is most likely being caused by the UFW Firewall being called during shutdown or init. You can test this by disabling UFW, then cycling a few shutdown and startups to see.
If it persists, it is likely a missing entry in the iptables. In which case you might try a later kernel like 6.3:

sudo add-apt-repository ppa:tuxinvader/lts-mainline

sudo apt update && sudo apt install linux-generic-6.03


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