Why is there a black screen in Kubuntu?

Question

linux

some time after installing Kubuntu, it started to boot into a black screen with a cursor. From the flash drive it boots normally. reinstalling didn't help. What could go wrong so that everything broke and did not get fixed after the reinstallation?

Answer 1

Quote about the underground knock lead?
You need to start with what kind of video card. If NVidia - which driver. Check dmesg for errors, other logs.