I have installed the distro 20.04 before several months, it was working fine. Before one month I have updated it through the updater, and then, when I rebooted and then, there was a black screen with the choices, Ubuntu, ... and Windows (I have a dual device). To start Ubuntu normally leads to a totally black screen. I can only start Ubuntu advanced options and then in recovery mode. Every few days, I update again but despite that, it is impossible to start the Ubuntu normally. My question is if there is a way to simply repair the system, or it is mandatory to reinstall it with an USB key.
Previously I tried to update and upgrade with the terminal by apt update and apt upgrade, but nothing helps.