After upgrading a computer from Ubuntu 16.04 LTS to Ubuntu 18.04 LTS or Ubuntu 18.04 LTS to Ubuntu 20.04 LTS, during boot the screen goes blank (turns black), all HD disk activity halts, and the system becomes frozen. This event can also occur on a fresh installation or when updates are installed. This is due … Continue reading Ubuntu Linux – Black screen and frozen system after upgrade and/or install