[root@mudpie:/etc/nixos]# nixos-rebuild switch
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/ivxh07xjcvrwph5ssi9fpp24vpn1zngz-unit-saned.service.drv
  /nix/store/y3qfja2kz97jh94dn0bjm1qfc3h73060-unit-saned.socket.drv
  /nix/store/qrbvp8v5ww6r7rhhqbmqjhsmc7d9lh22-system-units.drv
  /nix/store/7pckj21r6zfwi5g6f2mjxbk8pnc7gd78-etc.drv
  /nix/store/didslprcjkiwh953jsb8bksbzsldybk7-nixos-system-mudpie-16.09.1698.2da8a5d.drv
building path(s) ‘/nix/store/9cb8ya2ic75k03kxi9dv53m39xaljmbf-unit-saned.service’
building path(s) ‘/nix/store/2vqykv8k7py6l7b3z25y0d6sknj87j11-unit-saned.socket’
building path(s) ‘/nix/store/3k0nlfllmw7b2nc5jlrqdscgwpcif13w-system-units’
building path(s) ‘/nix/store/a1him9rh77xqgb1m5rz7dsgkhpyhy0nf-etc’
building path(s) ‘/nix/store/m9iv57xsisp8s58grsv01ha3bvi6gdwq-nixos-system-mudpie-16.09.1698.2da8a5d’
updating GRUB 2 menu...
activating the configuration...
setting up /etc...
the following new units were started: saned.socket
warning: the following units failed: saned.service

● saned.service - Scanner Service
   Loaded: loaded (/nix/store/9cb8ya2ic75k03kxi9dv53m39xaljmbf-unit-saned.service/saned.service; bad; vendor preset: enabled)
   Active: failed (Result: resources)

Feb 15 17:35:25 mudpie systemd[1]: saned.service: Got more than one socket.
Feb 15 17:35:25 mudpie systemd[1]: saned.service: Failed to run 'start' task: Invalid argument
Feb 15 17:35:25 mudpie systemd[1]: Failed to start Scanner Service.
Feb 15 17:35:25 mudpie systemd[1]: saned.service: Unit entered failed state.
Feb 15 17:35:25 mudpie systemd[1]: saned.service: Failed with result 'resources'.
warning: error(s) occurred while switching to the new configuration