downloading Nix 1.11.13 binary tarball for x86_64-linux from 'https://nixos.org/releases/nix/nix-1.11.13/nix-1.11.13-x86_64-linux.tar.bz2' to '/tmp/nix-binary-tarball-unpack.n03b6NRkn4'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 27.6M  100 27.6M    0     0  3522k      0  0:00:08  0:00:08 --:--:-- 5172k
performing a single-user installation of Nix...
directory /nix does not exist; creating it by running ‘mkdir -m 0755 /nix && chown pcallahan /nix’ using sudo
copying Nix to /nix/store.................................
initialising Nix database...
installing ‘nix-1.11.13’
building path(s) ‘/nix/store/qxng2qbahcf6dz19llqb4ivxw0bar57l-user-environment’
created 6 symlinks in user environment
downloading Nix expressions from ‘https://d3g5gsiof5omrk.cloudfront.net/nixpkgs/nixpkgs-17.09pre112229.e619ace733/nixexprs.tar.xz’...
downloading ‘https://d3g5gsiof5omrk.cloudfront.net/nixpkgs/nixpkgs-17.09pre112229.e619ace733/nixexprs.tar.xz’... [6287/8878 KiB, 5749.6 KiB/s]
unpacking channels...