iptables is currently defined in `all-packages.nix` to be iptables-compat. That package does however not contain `ethertypes`. Only `iptables-nftables-compat` contains this file so the symlink dangles. (cherry picked from commit 2eeecef3fc70e35b2f4c6d8424e4c726c140e330)
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.