Hello Linux Geeksters. As you may know, Linus Torvalds himself announced the 4th release candidate of Kernel 3.12. Among others, it brings improvements to the ARM architecture, some file system updates and bugfixes. For more information, see the official changelog.

In this article I will show you how to install Kernel 3.12 RC4 on Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Linux Mint 16 Petra, Linux Mint 15 Olivia, Linux Mint 14 Nadia, Linux Mint 13 Maya, Debian Sid, Debian Jessie, Debian Wheezy, Elementary OS 0.2 Luna, Pear OS 8 and other Debian/Ubuntu derivates.
There is no repository available for the Linux Kernel 3.12 RC4, but the needed deb packages are available via kernel.ubuntu.com, so installing it is easy. Follow the instructions for your architecture exatly, in order to get a successful installation.
How to install Kernel 3.12 RC4 on 32 bit Ubuntu, Linux Mint, Debian, Pear OS, Elementary OS and other Ubuntu/Debian derivates:
Download the needed packages:
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-headers-3.12.0-031200rc4_3.12.0-031200rc4.201310080738_all.deb
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-headers-3.12.0-031200rc4-generic_3.12.0-031200rc4.201310061735_i386.deb
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-image-3.12.0-031200rc4-generic_3.12.0-031200rc4.201310061735_i386.deb
Install Kernel 3.12 RC4:
$ sudo dpkg -i linux-headers-3.12*rc4*.deb linux-image-3.12*rc4*.deb
How to install Kernel 3.12 RC4 on 64 bit Ubuntu, Linux Mint, Debian, Pear OS, Elementary OS and other Ubuntu/Debian derivates:
Download the needed packages:
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-headers-3.12.0-031200rc4_3.12.0-031200rc4.201310080738_all.deb
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-headers-3.12.0-031200rc4-generic_3.12.0-031200rc4.201310080738_amd64.deb
$ wget -c kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc4-saucy/linux-image-3.12.0-031200rc4-generic_3.12.0-031200rc4.201310080738_amd64.deb
Install Kernel 3.12 RC4:
$ sudo dpkg -i linux-headers-3.12*rc4*.deb linux-image-3.12*rc4*.deb