ListFiller.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class ListFiller : MonoBehaviour 
{

    void Awake () 
    {

        var list = Enumerable.Range (0, 10).OrderBy (x => Guid.NewGuid ()).Take (5);
        
        foreach (int i in list) Debug.Log (i);
    
    }
}