Why are there horizontal stripes after installing Ubuntu?

Question

linux

Up to a certain point, ubuntik worked as it should, but after some time it gave me an error:
"Decoding failed: failed unpacking initramfs" and after that horizontal stripes appeared on the screen and ubuntu hung
with initramfs fixed the problem, but the stripes do not disappear. Installed Windows as the 2nd system. But the problem was before her.

Answer 1

update the drivers for the video card or install closed ones.