$ sh <(curl https://nixos.org/nix/install) --no-daemon 
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                     Dload  Upload   Total   Spent    Left  Speed
    100  2476  100  2476    0     0   5417      0 --:--:-- --:--:-- --:--:--  5406
    downloading Nix 2.2.1 binary tarball for x86_64-linux from 'https://nixos.org/releases/nix/nix-2.2.1/nix-2.2.1-x86_64-linux.tar.bz2' to '/tmp/nix-binary-tarball-unpack.n5vqvsi4Uq'...
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                     Dload  Upload   Total   Spent    Left  Speed
    100 22.5M  100 22.5M    0     0  4016k      0  0:00:05  0:00:05 --:--:-- 4377k
    Note: a multi-user installation is possible. See https://nixos.org/nix/manual/#sect-multi-user-installation
    performing a single-user installation of Nix...
    directory /nix does not exist; creating it by running 'mkdir -m 0755 /nix && chown x80486 /nix' using sudo
    [sudo] password for x80486: 
    copying Nix to /nix/store.................................
    initialising Nix database...
    Nix: creating /home/x80486/.nix-profile
    installing 'nix-2.2.1'
    error: cloning builder process: Operation not permitted
    error: unable to start build process
    /tmp/nix-binary-tarball-unpack.n5vqvsi4Uq/unpack/nix-2.2.1-x86_64-linux/install: unable to install Nix into your default profile