Major bug after intallation

Hy, I installed Xubuntu (24.04) and tried also Linux Lint (22.1). Then I just did : sudo apt-get update && sudo apt-get upgrade And got all kind of troubles : Wrong cursor, black screen on desktop, no more desktop icons, no more icons (enlarge, close...) on Thunar. In short, it makes it unusable. I tested it on 3 computers (Lenovo 540, lenovo 450 and Fujitsi E546), same result in the past 2 days. I install very frequently computers in the past 10 years.