The last stable libc6 version is the v2.13. This is something that has been bothering me the last days. The update is needed to run Steam, Popcorn Time and some other apps. There is an unofficial installer for Steam that uses the official lib from Ubuntu and works great (I used it for a few hours) but I needed the update for other things so I had to proceed. The info on the internet is confusing, mostly they say that you can update from the testing repos Jessie and/or Sid, but if you do that straight forward you can mess up your system. When I tried it, almost loose the Gnome enviroment, all Gnome related was on the Delete list. -ALWAYS look what you are installing, especially from non stable or unofficial reposotories-
Spending some time looking for a solution I found this post on Stackoverflow, and works flawlessly (for me at least).
The Steps you have to follow:
First of all you need to exit out of your display manager by pressing CTRL-ALT-F1. Then you can stop x (slim) with:
sudo /etc/init.d/slim stop
*Replace slim with your Display manager, e.g. in my case was gdm3
-THIS STEP IS VERY IMPORTANT-
Next you have to add the Sid repo
Add the following line to the file /etc/apt/sources.list:
deb http://ftp.debian.org/debian sid main
You can do this from Synaptic as well before you stop the display manager. Config-Repositories-Other Software-add...
apt-get -t sid install libc6-amd64 libc6-dev libc6-dbg
After that I recommend to delete the Sid repo.
Note: I did this and worked very well. I am not responsible if you mess up your system. Do your research first, be sure and backup your important data before doing anything.
Original Post: Link
If you need help with something just post a reply and I would try to help you, and I'm sure that the advanced users on the forum will try as well.
Note 2: I'm a non-native english speaker, so excuse me for any misspelling.
Edited by RandomGG, 25 July 2014 - 10:35 AM.