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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 
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Considering that it says "may" not run, can you try just running it anyway and see if it works? –  MatrixFrog Feb 18 '13 at 3:02
    
@MatrixFrog with 13.10 this error is blcking, and after installing 14.04 it is not ;) –  Boris May 2 at 6:18
    
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2 Answers 2

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

Open up a terminal (Ctrl+T).

sudo apt-get update

sudo apt-get install ia32-libs

sudo apt-get upgrade

A reboot may be required

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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.

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