I recently installed Ubuntu 20.04 in my laptop. After installation my system was unable to restart and was stuck at black-blank screen. After no response i manually turn off my machine then when i booted up system it worked fine. Later when i tried to shutdown, it again got stuck at black screen then i had to again turn off my machine manually. I also do not have a dedicated graphic card on my system. It runs Intel HD graphics. Please provide me some solution to resolve this issue.