Cannot download kernel in latest linux development kernel for Ubuntu

I have downloaded the latest linux development kernel (Robert Nelson)
for Ubuntu linux-dev-3.1-rc9-d4 at https://github.com/RobertCNelson/linux-dev

In the system.sh, there seems to be something wrong with the location
of the kernel pointed by
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6-stable.git

I am not able to download the kernel using the above command. Also,
why use linux-2.6 when the kernel is supposed to be 3.1?

No problems with the stable kernel releases.

Thank you.

Before kernel.org went down last month, that was the stable tree, even
when the kernel changed to 3.x, the 2.6 in the name became
meaningless..

But now that kernel.org git tree's are back, that tree is gone and
replaced with:

git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

so use that instead..

patched the readme:
https://github.com/RobertCNelson/linux-dev/commit/69abfad0f99475f86bc329e1b29564807485ea48

Regards,