Debian DELETES everything if I do apt-get type stuff.

I was using Debian on my computer and I love the game supertuxkart. So since I previously reinstalled Debian, I was downloading supertuxkart off the ubuntu package site(packages.ubuntu.com). I was installing the dependency libstdc++6 from the ubuntu version and it gave a broken dependency. If I try to fix it says it will remove everything. If I try to fix that, it can't because there is a broken dependency. I usually have to reinstall at least once a week but this was the time I almost got everything to work perfectly. Other then my wi-fi. But seriously it is aoying please help.

I'm on Debian 8 Jessie ruing gnome and the default apps.

Oh, I did install the multimedia codecs and ALL the game apps(games-GENRE) except for racing.

I'm in a rush.