These are few steps to get Steam running on Ubuntu:

wget -c
dpkg -i steam.deb
apt-get install -f
apt-get update

Solutions for some issues

Some time ago I needed 32 bit flash even on 64 bit system - I don’t need it currently but I’m living this as a tip.

apt-get install adobe-flashplugin:i386

After Ubuntu upgrade I was unable to run Steam anymore - It shouted on me with strange “networking problem”. I have to clean Steam configuration with:

steam --reset
Sources link link