[ISSUE] `nix-shell -p hello`, does not working.

[voidlinux-github@inbox.vuxu.org]

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New issue by LinArcX on void-packages repository

https://github.com/void-linux/void-packages/issues/18970

Description:
<!-- Don't request update of package. We have a script for that. https://alpha.de.repo.voidlinux.org/void-updates/void-updates.txt . However, a quality pull request may help. -->
### System

* xuname:  
Void 5.4.15_1 x86_64 GenuineIntel notuptodate hold rrDDDFFF
* package:  
  nix-2.3.2_2  

### Expected behavior
Want to work hello example of nix package manager without any issue.

### Actual behavior
After installing nix package, if you try to use: `nix-shell -p hello`, it'll produce this error:
```
warning: Nix search path entry '/home/linarcx/.nix-defexpr/channels' does not exist, ignoring
error: file 'nixpkgs' was not found in the Nix search path (add it using $NIX_PATH or -I), at (string):1:13
```
If you try it with __sudo__:
`error: file 'nixpkgs' was not found in the Nix search path (add it using $NIX_PATH or -I), at (string):1:13`

Also, whenever you want to login again, you'll we see this message:
Also when i restart and login again in my system, it says:
```
mkdir: cannot create directory '/nix/var/nix/profiles/per-user/linarcx': Permission denied
WARNING: bad ownership on /nix/var/nix/profiles/per-user/linarcx
```


### Steps to reproduce the behavior
1. Install nix package
2. re-login