I created a Xubuntu 20.04 USB, and I entered the live CD environment. However, it looked something like this. (I recreated this image because I couldn't actually screenshot the problem.) The whole screen is staggered in sections to the right, including the menus, and the only normal thing is the cursor. When I installed the Xubuntu desktop environment on Ubuntu (already installed on my PC) using the command line, the same thing happens. How can I fix this?