Linus Torvalds announced to the kernel mailing list on Sunday that Linux 3.12-rc3 is now available. Being midway through the development cycle and well past the merge window, the 3.12-rc3 changes aren’t too exciting but mostly just bug-fixes scattered throughout the kernel.

In this article I will show you how to install the Linux Kernel 3.12 RC3 on Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Linux Mint 15 Olivia and other Ubuntu/Debian derivates.
Linux Kernel 3.12 RC3 no avilible on ppa, but avilible for download .deb package from kernel.ubuntu.com. Follow next instruction for install on your system architecture:

How to install Kernel 3.12 RC3 on 32 bit Ubuntu/Debian based distribution:

Download package:

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-headers-3.12.0-031200rc3_3.12.0-031200rc3.201309291835_all.deb

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-headers-3.12.0-031200rc3-generic_3.12.0-031200rc3.201309291835_i386.deb

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-image-3.12.0-031200rc3-generic_3.12.0-031200rc3.201309291835_i386.deb

Install Kernel 3.12 RC3:

$ sudo dpkg -i linux-headers-3.12*.deb linux-image-3.12*.deb

How to install Kernel 3.12 RC3 on 64 bit Ubuntu/Debian based distribution:

Download package:

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-headers-3.12.0-031200rc3_3.12.0-031200rc3.201309291835_all.deb

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-headers-3.12.0-031200rc3-generic_3.12.0-031200rc3.201309291835_amd64.deb

$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc3-saucy/linux-image-3.12.0-031200rc3-generic_3.12.0-031200rc3.201309291835_amd64.deb

Install Kernel 3.12 RC3:

$ sudo dpkg -i linux-headers-3.12*.deb linux-image-3.12*.deb

Read also: How to install Kernel 3.12 Final release on 32/64 bit Ubuntu, Linux Mint and Debian Linux