How do i upgrade using command line or what is the best way to get 2020.3 should I just download os image if I'm running kali already? My version of kali 2017.3 is extremely slow and lags a lot I have plenty of memory and I have a terabyte hard drive so and have a lot of ram but im not sure why its running so slow and I keep having to force shut it off using the power button on my laptop