[sudo] password for alex:
building the system configuration...
warning: Git tree '/home/alex/workshop/nix-things' is dirty
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_MONETARY = "en_GB.UTF-8",
LC_PAPER = "en_GB.UTF-8",
LC_MEASUREMENT = "en_GB.UTF-8",
LC_TIME = "en_GB.UTF-8",
LC_NUMERIC = "en_GB.UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("en_US.UTF-8").
would activate the configuration...
https://github.com/NixOS/nixpkgs/issues/8398