If you stuck in the login screen and can’t load the Ubuntu desktop, follow those steps. when you on the login screen, press ctrl + shift + alt + f1. A black screen appeared? No? Just the login page? So try ctrl + shift + alt + f2. Still the login screen? try ctrl + shift + alt + f3. If the login screen still showing? Try to use another external keyboard. a black screen appeared? ok, type your username then ENTER and type your password then ENTER. type ping 8.8.8.8 then ENTER to ensure you have a good Internet connection.