Hello,
First of all i sorry if this topic was discussed befeore. I searched but did not found anything to this.
So.. The problem is, that after i installed the Ubuntu Mate 20.0.4, rebooted in the new installation and after the lightdm login the desktop was fragmented and can not be used. I enter a new tty and update and upgrade it via cli, the rebooted and it seems that does have no effect.
If anyone encountered that before please leave a comment.
Thank you