warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
system: "x86_64-linux", multi-user?: yes, version: nix-env (Nix) 1.11.15, channels(root): "nixos-18.03pre121255.45a85eaceb, nixpkgs-18.03pre121255.45a85eaceb", channels(alois): "", warning: Nix search path entry ‘/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs’ does not exist, ignoring
nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixpkgs