Hi everyone. I'm a disaster, so please be patient, and I've unistalled libc6. Someone here had the same problem back in 2004, I'm in this exact situation:
http://www.linuxquestions.org/questi...-libc6-176619/
(hoping that reposting is better than necromancing)
and I get stuck on "Step 4" of ToniT's guide.
I have a live CD and booted from there, so my steps are a bit different from torriate's.
Here it is, more or less, what I've done so far:

sudo -i
mkdir /mnt/sda2
#/mnt/ directory is empty and I get an error if I mount before making the directory myself
mount /dev/sda2 /mnt/sda2
#i have two partitions: sda1 and sda2. sda1 contains /home and sda2 contains /, so i GUESS i should mount sda2
#mount seems to work fine as I see a lot of directories in /mnt/sda2 such as bin, etc, root, lib, usr, var
#if I go with 'chroot /mnt/sda2' it fails saying that it can't find /bin/bash
cp /lib/x86_64-linux-gnu/libc.so.6 /mnt/sda2/lib/x86_64-linux-gnu
#i found libc.so.6 in my live CD and i copy it where i THINK it should be
chroot /mnt/sda2 /sbin/ldconfig
chroot: failed to run command: 'sbin/ldconfig': No such file or directory

I red torriate's post and he has the same problem; to resolve it he copies ldconfig (that i'm able to locate) somewhere. I copied it pratically everywhere (/mnt/sda2, /mnt/sda2/sbin <- it's already there, /mnt/), but nothing seems to work. I'm deeply confused by mounting, I think I'm just misunderstanding something. Sorry for language errors, I hope you can help me. Thanks in advance.

Why on Earth did you remove the C library?
To add to that, what were you trying to do? An upgrade? A few more details would be helpful.

Pretty much for the same reason torriate did it ten years ago :C I got stuck in a dependency problem trying to install something. I think ToniT's guide and torriate's response should already give me the solution, but i need help to understand them... I think/hope I may be fine if I manage to chroot.

I don't have Debian, but run "which ldconfig" to find out where it lives nowadays and adjust command appropriately - may be /usr/sbin these days.

That tells us very little. What are you using: Stable or Testing? What are you trying to install?
My guess is you are using Stable, but did, or tried to, upgrade libc6 to the version in Testing. Yes, no? If so, you have created a big mess. If you are using Testing and are having an upgrade problem, then I do not possess any knowledge to help.

Output is "/sbin/ldconfig". The problem has something to do with this: http://unix.stackexchange.com/questi...e-or-directory
"This error means that there is no [program name] directory inside chroot".
torriate resolve this copying it:

cp /mnt/tmp/sbin/ldconfig /mnt/sbin
chroot /mnt /sbin/ldconfig

but I can't understand where I should copy it.
I'm using Testing (jessie). I was trying to install SimpleScreenRecorder and I found a package which installed me an older version of libc6; this gave me an error (when trying to apt-get install -f) that I don't remember (I googled it from that debian, so I can write it if I manage to recover it). I then unistalled libc6.

So, to sum this up, you are using Debian testing, an unstable version, and installing a 3rd party application on it that has not been updated for over a year and then trying to use 10 year old directions for fixing a broken system.

Remove the package you installed and install a modern libc6.

Learn to use ffmpeg to do your screen recording.

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Yes, and all of that is totally unrelated to the problem. I was basically asking if someone could help me understanding those directions (which are 100% correct); the title of this thread could have just been "how to install libc6 from a live CD", regardless the reasons why someone unistalled it. All the difficulty (personally speaking) was in mounting and chrooting; I managed to solve the problem after reading torriate's reply more carefully, and I actually learned a lot from this.
We probably have different ideas about what linux is. I find getting in trouble and trying to adapt to your problem solutions you find online highly instructive. I use windows when I want a boring os.

No is not unrelated. It is the cause of the problem. With a few rare exceptions, the only safe way to add third-party packages is to compile them from source. Simply adding packages or repositories from non-Debian sources will mostly likely result in a damaged, or sometimes completely broken, system.

In this case, you are messing around with the C library, which is a fundamental component of the core of the system. It is a bad idea to tamper with it, unless there is a very good reason, and then the utmost care is needed.