Nix installation script dies with unknown error if socket is in use

[felzix]

Describe the bug

Hit bug running the easy setup script: sh <(curl -L https://nixos.org/nix/install) --daemon.

I only partially cleared out my old nix installation: the socket was still in use because I had run systemctl disable --now nix-daemon.service earlier but hadn't disabled/stopped it.

Nix should die here but it should understand why it's dying. Instead it gave me these outputs:

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo systemctl start nix-daemon.socket

to start the nix-daemon.socket

Job failed. See "journalctl -xe" for details.

---- oh no! --------------------------------------------------------------------
Jeeze, something went wrong. If you can take all the output and open
an issue, we'd love to fix the problem so nobody else has this issue.

:(

We'd love to help if you need it.

You can open an issue at https://github.com/nixos/nix/issues

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