安装Ubuntudde 20.04时出错

I recently installed ubuntuDDE 20.04. I followed the basic procedure of installing. Installing went well. But after selecting ubuntu from grub option menu, I just see a white screen with cursor. I can move the cursor, no buttons to click. I am not able to login into ubuntu.white screen On randomly typing I found out that when click to 'NUM LOCK' button a black screen stating "UBUNTU FOCAL FOSSA Linux tty1"come.focal foss img

我尝试输入凭据,但是每当我键入某些内容时,此屏幕就会消失。

这之后我不知道该怎么办。