My monitor allow me to rotate it 90degree into vertical pos, which is good for my web design usage. In ubuntu, i can install a gui app and it allow me to rotate the screen easily with similar experience on windows system. However, rPi do not have a bios, so the way to do it is to edit /boot/config.txt Then, add in this line at the bottom of the file if it is not exists yet: Refer here for more info.