Systemd is complaining that it can't delay the startup of device units. We have a before dependency on the respective device unit for every netdev service, which doesn't make any sense because we create the actual interface in this service.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.