Ubuntu 14.04 LTS has been released with Linux kernel 3.13 (development version) and not a stable version of the Linux kernel (3.14 or 3.12). Is thís because of many new features being added in Linux kernel 3.13?
Ubuntu 14.04 – Why Ubuntu 14.04 LTS Uses Linux Kernel 3.13
14.04kernellts
Best Answer
You are making the assumption that odd-numbered kernel releases are unstable, which has not been true since version 2.6.x. — that’s 2003. See the History part on http://en.wikipedia.org/wiki/Linux_kernel.
The development (unstable?) versions are now distributed in the various developers’ git trees; the thing more resembling the old odd-numbered kernels would be probably the linux-next git tree.