Hi all
When I do a nixos-rebuild switch, I get the following error
restarting sysinit-reactivation.target
reloading the following units: dbus.service
restarting the following units: polkit.service
starting the following units: accounts-daemon.service
warning: the following units failed: ensure-printers.service
× ensure-printers.service - Ensure NixOS-configured CUPS printers
Loaded: loaded (/etc/systemd/system/ensure-printers.service; enabled; preset: ignored)
Active: failed (Result: exit-code) since Sun 2025-04-20 17:51:34 BST; 269ms ago
Invocation: 90a73494ef974254a673467e5a3bc3fd
Process: 13082 ExecStart=/nix/store/ilhk3zg3jrg2q9nh6p33h74h4gsmzpzr-unit-script-ensure-printers-start/bin/ensure-printers-start (code=exited, status=1/FAILURE)
Main PID: 13082 (code=exited, status=1/FAILURE)
IP: 0B in, 0B out
IO: 0B read, 0B written
Mem peak: 2.2M
CPU: 12ms
Apr 20 17:51:30 nixos systemd[1]: Starting Ensure NixOS-configured CUPS printers...
Apr 20 17:51:34 nixos ensure-printers-start[13083]: lpadmin: Unable to connect to 192.168.1.21:631: Host is down
Apr 20 17:51:34 nixos systemd[1]: ensure-printers.service: Main process exited, code=exited, status=1/FAILURE
Apr 20 17:51:34 nixos systemd[1]: ensure-printers.service: Failed with result 'exit-code'.
Apr 20 17:51:34 nixos systemd[1]: Failed to start Ensure NixOS-configured CUPS printers.
warning: error(s) occurred while switching to the new configuration
I previously had issues with the printer but eventually got it working, I tried changing my config files to make them more modular but now have this error.
My configuration.nix looks like this
# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).
{ config, pkgs, ... }:
{
imports =
[<nixpkgs/nixos/modules/services/hardware/sane_extra_backends/brscan5.nix>
# Include the results of the hardware scan.
./hardware-configuration.nix
./packages.nix
];
# Bootloader.
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
networking.hostName = "nixos"; # Define your hostname.
# networking.wireless.enable = true; # Enables wireless support via wpa_supplicant.
# Configure network proxy if necessary
# networking.proxy.default = "http://user:password@proxy:port/";
# networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
# Enable networking
networking.networkmanager.enable = true;
# Set your time zone.
time.timeZone = "Europe/London";
# Select internationalisation properties.
i18n.defaultLocale = "en_GB.UTF-8";
i18n.extraLocaleSettings = {
LC_ADDRESS = "en_GB.UTF-8";
LC_IDENTIFICATION = "en_GB.UTF-8";
LC_MEASUREMENT = "en_GB.UTF-8";
LC_MONETARY = "en_GB.UTF-8";
LC_NAME = "en_GB.UTF-8";
LC_NUMERIC = "en_GB.UTF-8";
LC_PAPER = "en_GB.UTF-8";
LC_TELEPHONE = "en_GB.UTF-8";
LC_TIME = "en_GB.UTF-8";
};
# Enable the X11 windowing system.
# You can disable this if you're only using the Wayland session.
services.xserver.enable = true;
# Enable the KDE Plasma Desktop Environment.
services.displayManager.sddm.enable = true;
services.desktopManager.plasma6.enable = true;
# Configure keymap in X11
services.xserver.xkb = {
layout = "gb";
variant = "";
};
# Configure console keymap
console.keyMap = "uk";
# Enable CUPS to print documents.
services.printing.enable = true;
services.avahi = {
enable = true;
nssmdns4 = true;
openFirewall = true;
};
services.printing = {
listenAddresses = [ "*:631" ];
allowFrom = [ "all" ];
browsing = true;
defaultShared = true;
openFirewall = true;
};
# Enable sound with pipewire.
hardware.pulseaudio.enable = false;
security.rtkit.enable = true;
services.pipewire = {
enable = true;
alsa.enable = true;
alsa.support32Bit = true;
pulse.enable = true;
# If you want to use JACK applications, uncomment this
#jack.enable = true;
# use the example session manager (no others are packaged yet so this is enabled by default,
# no need to redefine it in your config for now)
#media-session.enable = true;
};
# Enable touchpad support (enabled default in most desktopManager).
# services.xserver.libinput.enable = true;
# Define a user account. Don't forget to set a password with ‘passwd’.
users.users.martyn = {
isNormalUser = true;
description = "SquarePeg";
extraGroups = [ "networkmanager" "wheel" ];
packages = with pkgs; [
kdePackages.kate
# thunderbird
];
};
# Enable automatic login for the user.
services.xserver.displayManager.autoLogin.enable = true;
services.xserver.displayManager.autoLogin.user = "squarepeg";
# Allow unfree packages
nixpkgs.config.allowUnfree = true;
# Enable bluray/dvd
boot.kernelModules = [ "sg" ];
# Enable fonts
fonts.packages = with pkgs; [ nerdfonts ];
# Enable Steam
programs.steam = {
enable = true;
remotePlay.openFirewall = true;
dedicatedServer.openFirewall = true;
localNetworkGameTransfers.openFirewall = true;
};
# Steam cursor fix
programs.steam.package = pkgs.steam.override {
extraPkgs = p: [
p.kdePackages.breeze
];
};
# List packages installed in system profile. To search, run:
# $ nix search wget
environment.systemPackages = let
libbluray = pkgs.libbluray.override {
withAACS = true;
withBDplus = true;
};
myVlc = pkgs.vlc.override { inherit libbluray; }; # renamed this to avoid potential shadowing by `with pkgs;`
in [
myVlc
];
# Some programs need SUID wrappers, can be configured further or are
# started in user sessions.
# programs.mtr.enable = true;
# programs.gnupg.agent = {
# enable = true;
# enableSSHSupport = true;
# };
# List services that you want to enable:
# Enable the OpenSSH daemon.
# services.openssh.enable = true;
# Open ports in the firewall.
# networking.firewall.allowedTCPPorts = [ ... ];
# networking.firewall.allowedUDPPorts = [ ... ];
# Or disable the firewall altogether.
networking.firewall.enable = false;
# This value determines the NixOS release from which the default
# settings for stateful data, like file locations and database versions
# on your system were taken. It‘s perfectly fine and recommended to leave
# this value at the release version of the first install of this system.
# Before changing this value read the documentation for this option
# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
system.stateVersion = "24.11"; # Did you read the comment?
}
My hardware-configuration.nix is
# Do not modify this file! It was generated by ‘nixos-generate-config’
# and may be overwritten by future invocations. Please make changes
# to /etc/nixos/configuration.nix instead.
{ config, lib, pkgs, modulesPath, ... }:
{
imports =
[ (modulesPath + "/installer/scan/not-detected.nix")
];
boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" "sr_mod" ];
boot.initrd.kernelModules = [ ];
boot.kernelModules = [ "kvm-amd" ];
boot.extraModulePackages = [ ];
fileSystems."/" =
{ device = "/dev/disk/by-uuid/27c2f63e-91e9-405b-ac75-d386683bae75";
fsType = "btrfs";
options = [ "subvol=@" ];
};
fileSystems."/DATA" =
{ device = "/dev/disk/by-uuid/c5f12c62-1e4c-4c34-b949-1c9f47857702";
fsType = "ext4";
};
fileSystems."/STEAM" =
{ device = "/dev/disk/by-uuid/830814ac-e33f-443f-9b62-7795c36db8db";
fsType = "ext4";
};
fileSystems."/STEAM-HDD" =
{ device = "/dev/disk/by-uuid/76230a19-9d42-42ab-bf54-ebbb3ecca662";
fsType = "ext4";
};
fileSystems."/boot" =
{ device = "/dev/disk/by-uuid/FC00-6584";
fsType = "vfat";
options = [ "fmask=0077" "dmask=0077" ];
};
swapDevices =
[ { device = "/dev/disk/by-uuid/456369f9-e605-4f4d-9097-b70b5cfaf17d"; }
];
# Enables DHCP on each ethernet and wireless interface. In case of scripted networking
# (the default) this is the recommended approach. When using systemd-networkd it's
# still possible to use this option, but it's recommended to use it in conjunction
# with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
networking.useDHCP = lib.mkDefault true;
# networking.interfaces.enp38s0.useDHCP = lib.mkDefault true;
nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
# Enable Printer
hardware.printers = {
ensureDefaultPrinter = "Brother";
ensurePrinters = [{
name = "Brother";
location = "office";
model = "everywhere";
ppdOptions = {
pageSize = "A4";
};
description = "Brother MFC-J4340DW";
deviceUri = "ipp://192.168.1.21/ipp";
}];
};
# Enable Scanner
hardware = {
sane = {
enable = true;
brscan5 = {
enable = true;
netDevices = {
home = { model = "MFC-J4340DW"; ip = "192.168.1.21"; };
};
};
};
};
}
and finally I have some packages installed via a different config file (packages.nix):
{ pkgs, ... }:
{
environment.systemPackages = with pkgs; [
gitFull
kdePackages.yakuake
librewolf
kdePackages.kpat
strawberry-qt6
kdePackages.k3b
kdePackages.sddm-kcm
backintime
protonup-qt
makemkv
handbrake
mpv
calibre
fuse-emulator
zapzap
nfs-utils
yt-dlp
duf
mediaelch-qt6
picard
kdePackages.kdenlive
lutris
gramps
eza
aria2
veracrypt
gamemode
digikam
get_iplayer
kdePackages.kdeconnect-kde
];
}
Can anyone help?