Kernel compilation (Debian Jessie)
http://www.tecmint.com/kernel-compilation-in-debian-linux/
You will need 8-10 GB of free disk space!
apt-get install fakeroot kernel-package
wget -c https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.14.20.tar.xz
tar -xvJf linux-3.14.20.tar.xz
cd linux-3.14.20
cp /boot/config-`uname -r` .config
apt-get install libncurses5-dev
make menuconfig
make-kpkg clean
export CONCURRENCY_LEVEL=3
fakeroot make-kpkg --append-to-version "-customkernel" --revision "1" --initrd kernel_image kernel_headers
cd ..
dpkg -i linux-image-3.14.20-customkernel_1_amd64.deb linux-headers-3.14.20-customkernel_1_amd64.deb
Install Kernel 3.12 stable release on 64 bit Ubuntu
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.29-trusty/
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.29-trusty/linux-headers-3.12.29-031229-generic_3.12.29-031229.201409301235_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.29-trusty/linux-image-3.12.29-031229-generic_3.12.29-031229.201409301235_amd64.deb
Install
dpkg -i linux-headers-3.12*.deb linux-image-3.12*.deb
Remove
apt-get purge linux-image-3.12.0-* linux-headers-3.12.0-*