The stable version of Linux Kernel 3.11.0 has been made available recently which brings various updates and improvements. Here are some of the best features in kernel 3.11:

 Radeon dynamic power management support 
Adding new DRM display driver for the Renesas R-Car SoC 
Intel Haswell improvements 
Valley View / Bay Trail Support  
Xen and KVM virtualization now work for 64-bit ARM+, etc.

For full features, go here. In this article, we will see how to install Linux Kernel 3.11 in Ubuntu/Linux Mint via a simple bash script as described below, but you can install manually by downloading the appropriate deb packages from here.

Linux Kernel 3.11.0 Installation

Open the terminal and enter these commands at your own risk:

cd /tmp 
wget -O kernel-3.11 
chmod +x kernel-3.11  
sudo sh kernel-3.11  
sudo reboot

To uninstall kernel 3.11 and revert back to the previous kernel, enter this command:

    sudo apt-get purge linux-image-3.11.0*