try apt update && apt upgrade again.
We made some adjustments due to the new Unipi Iris HW, but this should work fine now.
You can try the current Node-RED image, which is available at this link: https://kb.unipi.technology/en:hw:007-patron:download-image:02-nodered
prior to starting Docker on our Debian 10-based OS Images, you have to update alternative for iptables e.g.:
As an alternative solution, you can compile the appropriate module from the source by yourself.
The reason is that the current Linux kernel does not contain full nftables support. The next released OS Image generation (Debian 11) will have it by default.
Is it possible to have while waiting for the repository, the kernel source archive 5.10.35 as well as the config file.