After the successful update to UP 5 in Mate environment, my screen has become too bright. There was a delicate grey touch before, and now it's gone. Please see the picture. There are no problems with fonts, I just don't know how to get some contrast to my screen. I have tried to change several themes, I keep Mint-X (version 1.
. I tried several others, but things were always the same: there is no contrast, the screen with Home folder, Documents etc. are just untolerably bright. Desktop, however, has remained the same as before, without changes. The problem apparently appeared when I switched Mate from 1.2 to 1.4, after typing
apt install mint-meta-debian-mate
into Terminal. Any help, please?