followed these directions: https://www.cyberciti.biz/faq/install-and-configure-tigervnc-server-on-ubuntu-18-04/
After I installed GNOME, I had trouble getting past the lock screen. I unlocked the screen with this command 'sudo loginctl unlock-sessions' (https://askubuntu.com/questions/341014/unlock-login-screen-using-command-line/921726)