The error is because the Raspberry Pi official package server did not release that version of LIBC6 in the stable (“wheezy”) branch. So we have to tell the APT package manager to use the “testing” branch. It’s all documented in the link above.
As suggested in that link I think somebody with more Linux programming experience should spend time to make an ANSI GUI like “rpi-config” to guide people through the download and setup. To start with I think I will try to submit some documentation updates…
