I'm running Ubuntu 14.04. I tried to install steam from the .deb from the steam website (steam_latest.deb) and this didn't work; I installed later with apt-get install steam (along with the 32 libraries and stuff) and this was successful, but I was left with a huge steam-launcher icon in the unity launcher, that does nothing and says "Invalid UTF-8" as a description, presumably from the first attempt, which was done with the deb through software center. I tried apt-get remove steam, but just got rid of the one that actually worked. Great. Tried to reinstall from deb, and uninstall again, now I have 3 giant ugly useless icons, and no working steam. Wonderful. Any help is appreciated. Thanks in advance!
You could try doing this
sudo apt-get purge steam-launcher and then install steam again.
purge - Purge is identical to remove except that packages are removed and purged. Purge meaning that any configuration files are deleted too. Let me know if this works or not.
Also try this and see which all directories have steam installed in it
dpkg -L steam-launcher
Make sure you have run all this before
sudo apt-get update and
sudo apt-get upgrade.