Ok, been using Gnome in 18.04, but I wanted some of that good old Unity again. So, I installed Mate-desktop. It works ok until it does not work. Sometimes when I log in, and especially after I log out and log back in I get double everything - two indicators, two menus, and two brisk-menus and two trash bins. It is a terrible experience. How can this be prevented? I very much would like to use Mate.