STEAM and AT Launcher for Minecraft don't work

Hello everyone! First post here and new to Linux. I recently had a laptop crap out on me and decided to go Linux so I can get a few more years out of it. I will be giving this laptop to my son but setting up Ubuntu MATE with steam and AT launcher have proven to be quite difficult.

This is what I have done so far:
-Fresh Ubuntu MATE 16.04 LTS install.
-updated software in the update center
-reboot
-install steam
-reboot

At this point STEAM opened and it looked like it received all its updates for a first time install. But after this (and another reboot) when I launch STEAM it opens real quick like it is looking for another update but closes out really fast. Not sure what is going on here. Any help will be appreciated. Thank you.

Wath is the output of steam when you run it from terminal ?
1.Open mate-terminal.
2.Type steam.
3.Press enter.
4.Copy output here .

I see that ATLauncher for minecraft is made in java . That means you need to install either openjdk or sun-java to be able to run it . You can do it via the software center. Also you have to set the executable bit for the file . here is how to do it :

  1. Open Caja.
    2.Navigate to the ATLauncher location
    3.Right click the file with the mouse
    4.Select “Properties”
    5.Click on permissions
    6.And there should be a checkbox with text “Allow executing file as program” or something simular.

And you should be able to install ATLauncher.

That should do it .