In Software Center some software is not found
For 64 bit Ubuntu systems only, add the i386 architecture before running all the below commands,
sudo dpkg --add-architecture i386
First enable multiverse repository,
sudo add-apt-repository multiverse
Update all the repositories
sudo apt-get update
Install steam package
sudo apt-get install steam
How did i know
$ apt-cache policy steam
N: Unable to locate package steam
$ sudo dpkg --add-architecture i386
$ apt-cache policy steam
steam:i386:
Installed: (none)
Candidate: 1:1.0.0.45-1ubuntu1
Version table:
1:1.0.0.45-1ubuntu1 0
500 http://ftp.cuhk.edu.hk/pub/Linux/ubuntu/ trusty/multiverse i386 Packages