I have installed unity hub from unity website. Later i have download latest version of unity editor that is 2019.3.15f from unity hub. But i whenever i want to build my game for android, it shows " SDK and JDK are invalid or missing ". So I have deleted the unity editor form files and deleted the unity hub also. Then, now when I am trying to install any version of unity from unity hub the blue line which shows the installation process of the editor finishes to the end, unfortunately, it automatically stops and the editor is not installing.