I have a newly installed 12.04 64bit Ubuntu machine! fully updated.
I couldn't find steam in software center. looking for the steam 64bit client.
I've desktop also with 12.04 64bit, which has the steam client in the software center. well at least when I installed it.
did someone remove steam from the software center?
If you're using a 64-bit version of ubuntu you wont see steam in the official repos. Only the 32-bit version is officially supported. I had to get the .deb from steam's web site.
Steam is no longer in the official Ubuntu repositories.
Until it reappears there, I would suggest installing Steam directly from Valve. If I remember, the .deb file that they provided will automatically add Valve repositories so that you can receive updates.
After I installed Ubuntu 13.04 64 bit, I realize that I don't see Steam in the software center anymore. I went to the official steam webpage, and downloaded the application. And installed it. It works fine. its a .deb file, which is easily installed. Btw on the website it is written to install steam on your pc, and it support ms Windows and Mac, but if you click on it using ubuntu it gives you a .deb file to install.
Good luck
if you install the repo as above then you will install the i386 32 bit steam.
It would be better to install the 64 bit deb file from the valve website if you have a 64 bit operating system.
I followed the steps on the linked page below to add the repository.
I had the exact same symptoms as the OP.
Steam still not showing in Software Center though.
I am now logged in to Steam and downloading Half-Life, which I purchased Years ago. Nice to see some continuity in account purchases!
Instructions to add the Steam PPA
Since Steam is no longer in the Ubuntu repositories it will never show up in Software Center. I find it preferable to have the Software Update maintain the local packages in as current a state as possible. This is why I linked the page above. Yes it takes a few terminal commands.
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B05498B7
sudo sh -c 'echo "deb http://repo.steampowered.com/steam/ precise steam" >> /etc/apt/sources.list.d/steam.list'
Now just
sudo apt-get install steam
The first command allows your system to verify that the package is digitally signed by Valve. The second adds the Valve repository so apt-get can use it. The third actually installs Steam.
I didn't want to search for the proper way to manually install the .deb package and this way allows me to keep steam updated with the rest of my system.