I installed Steam from the Ubuntu Software center and I have the steam icon on my desktop but i get the following errors

Updating Steam . . . . Checking for available updates
It downloads just a few Kb every time and then displays an Error :
Fatal Error : Steam needs to be online to update. Please confirm your network connection and try again.
(though my internet was working fine)
After trying multiple times, i got another error :
You are missing the following 32-bit libraries, and steam may not run : libc.so.6
On checking in synaptic i found it was related to Clam AV and it wanted to install a lot of packages along with it.
Why do i need to do that ? And any way will it help if i install all that ? Why the network error ?

Can any one advise ?