Running steam:
Steam needs to install these additional packages:
	libgl1-mesa-dri:i386, libgl1-mesa-glx:i386
password: .....

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Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgl1-mesa-glx:i386 : Depends: libglapi-mesa:i386 (= 10.1.3-0ubuntu0.4)
 unity-control-center : Depends: libcheese-gtk23 (>= 3.4.0) but it is not going to be installed
                        Depends: libcheese7 (>= 3.0.1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
Press return to continue:

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Error:
You are missing the following 32-bit libraries, and Steam may not run:
libGL.so.1

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sudo apt-get install libc6-i386

->
Reading package lists... Done
Building dependency tree
Reading state information... Done
libc6-i386 is already the newest version.
The following packages were automatically installed and are no longer required:
  libatk-bridge2.0-0:i386 libatspi2.0-0:i386 libcairo-gobject2:i386
  libcolord1:i386 libdbusmenu-gtk3-4:i386 libgtk-3-0:i386 liblcms2-2:i386
  libwayland-client0:i386 libwayland-cursor0:i386 libxkbcommon0:i386
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

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Launch Steam:
And start from the top again - > Steam needs to install these additional packages:
	libgl1-mesa-dri:i386, libgl1-mesa-glx:i386