NixOS installation in Ubuntu Hirsute

Help
1

When I try to download nixOS, I get this error, and the downloaded tar ball gets automatically deleted. I am using ubuntu hirsute.

HP-Pavilion:/home$ curl -L https://nixos.org/nix/install | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  2619  100  2619    0     0   6191      0 --:--:-- --:--:-- --:--:--  6191
downloading Nix 2.3.15 binary tarball for x86_64-linux from 'https://releases.nixos.org/nix/nix-2.3.15/nix-2.3.15-x86_64-linux.tar.xz' to '/tmp/nix-binary-tarball-unpack.mYPOHwGbIZ'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 25.6M  100 25.6M    0     0  3032k      0  0:00:08  0:00:08 --:--:-- 3605k
/tmp/nix-binary-tarball-unpack.mYPOHwGbIZ/unpack/nix-2.3.15-x86_64-linux/install: $HOME is not set

Then I set $HOME as my /home/user directory with the env command. But it shows the same error.

2

env only changes the environment for its childs, so if you want to use env you need to do it like this:

$ curl -L https://nixos.org/nix/install | env 'HOME=/home/user' sh

Or alternatively use your shells environment management tools to set HOME like this:

$ export HOME=/home/user
$ curl -L https://nixos.org/nix/install | sh

Though I am wondering why HOME is not already set…

3

Ok even I don’t know why it says $HOME wasn’t set, but now that i set it in the code and ran it as you suggested, I am getting a different error:

HP-Pavilion:/home $ curl -L https://nixos.org/nix/install | env 'HOME=/home/user' sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  2619  100  2619    0     0    814      0  0:00:03  0:00:03 --:--:--   941
downloading Nix 2.3.15 binary tarball for x86_64-linux from 'https://releases.nixos.org/nix/nix-2.3.15/nix-2.3.15-x86_64-linux.tar.xz' to '/tmp/nix-binary-tarball-unpack.sBCCmnvjjI'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 25.6M  100 25.6M    0     0  5494k      0  0:00:04  0:00:04 --:--:-- 5736k
Note: a multi-user installation is possible. See https://nixos.org/nix/manual/#sect-multi-user-installation
performing a single-user installation of Nix...
copying Nix to /nix/store...

error: could not set permissions on '/nix/var/nix/profiles/per-user' to 755: Operation not permitted
/tmp/nix-binary-tarball-unpack.sBCCmnvjjI/unpack/nix-2.3.15-x86_64-linux/install: unable to register valid paths