Rhombi when shutting down Ubuntu?

[mahesh]

Has anyone gotten rhombi in a row when shutting down Ubuntu?
This has happened to me many times after system has exited from GUI.

With rhombi I mean this shape: https://fi.wiktionary.org/wiki/Tiedo...ack_simple.svg
They're either filled with white or grey colour.

I use Ubuntu 22.04 LTS and my computer is old Sony Vaio.