Gaming graphic quality is so bad

[mahesh]

I am using ubuntu gnome version and tried other too like kubuntu and many other distro i have a problem in which when i run game its works fine but the graphics are so bad i tried both steam and wine games and linux native game too such as supertuxkart this issue is not occur when i am using linux mint and when i run games in past it worked fine but now its make game unplayable i request to give me some solution for this. wait for your reply eagerly.