The lxc-net.service unit won't come up and can't create the #bridge, erroring:
Failed to setup lxc-net.
Error: Could not process rule: Operation not supported
lxc-net[832121]: add table inet lxc;
lxc-net[832121]: ^^^^^^^^^^^^^^^^^^^
It turns out to be something in the differing kernel configuration and newer LXC tools in Bookworm. I've been running mainline kernels for years, but lxc-net (networking for unprivileged containers) broke with the kernel config I'd been using.
Re-doing my kernel config to start with the Bookworm config as a base fixed the issue. I don't know offhand what option(s) settings were different and causing the issue.
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