I'm trying to run Steam but 32-bit libraries are missing

Question

You are missing the following 32-bit libraries, and Steam may not run:
libXrandr.so.2
libpangoft2-1.0.so.0
libpango-1.0.so.0
libfreetype.so.6
libfontconfig.so.1
libgobject-2.0.so.0
libglib-2.0.so.0
libgtk-x11-2.0.so.0
libgtk-x11-2.0.so.0
libgdk-x11-2.0.so.0
libpangocairo-1.0.so.0
libgdk_pixbuf-2.0.so.0
libcairo.so.2
libpango-1.0.so.0
libfreetype.so.6
libfontconfig.so.1
libgobject-2.0.so.0
libglib-2.0.so.0
libXi.so.6
libasound.so.2
libXrender.so.1
libnss3.so
libnssutil3.so
libsmime3.so
libplc4.so
libnspr4.so
libdbus-1.so.3
libpng12.so.0
libcups.so.2
libgcrypt.so.11 

Answer 1

You need to add the foreign arch i386 to make i386 packages available.

sudo dpkg --add-architecture i386
sudo apt-get clean
sudo apt-get update
sudo apt-get install libgl1-mesa-dri:i386 libgl1-mesa-glx:i386 libc6-i386

Answer 2

I think you have 64-bit Ubuntu, if so, try this:

Open up a terminal (Ctrl + Alt + F1).

sudo apt-get update
sudo apt-get install ia32-libs
sudo apt-get upgrade

A reboot may be required

Answer 3

I have same problem and I have 64-bit Ubuntu 13.10.
Erick's answer does not work for me now because ia32-libs is not available anymore.

So I installed Ubuntu 14.04, the same problem occurs.
So I installed the available "32 libraries":

$ sudo apt-get update
$ sudo apt-get install lib32z1 
$ sudo apt-get install lib32ncurses5 
$ sudo apt-get install lib32bz2-1.0

Now launching Steam there is this warning:

Steam needs to install these additional packages: 
libgl1-mesa-dri:i386, libgl1-mesa-glx:i386, libc6:i386

These libraries are not available, but Steam runs fine on 14.04 for me even with this warning.