Following this documentation (multi-user nix upgrade on non-nixos (here, Arch)):
https://nix.dev/manual/nix/2.23/installation/upgrading
Typing the following command (as root):
nix-env --install --file '<nixpkgs>' --attr nix cacert -I nixpkgs=channel:nixpkgs-unstable
Outputs the folllowing:
replacing old 'nix-2.18.5'
replacing old 'nss-cacert-3.101'
installing 'nix-2.18.5'
installing 'nss-cacert-3.101'
so it installs a very old version of Nix.
Why is that?
Thanks for your help.
NB: I have tried running nix-channel --update but that doesn’t change anything.