• Firstly run the following command with the appropriate privilege:

sudo pacman -S linux-zen linux-zen-headers

• When asked for confirmation, type 'y', press ENTER
• Now the kernel is installed on your system.

We need to tell systemd-boot to boot with the newly kernel installed

• Open up a terminal and type these commands:

su

[Enter your password]

cd /
ls 

• At these stage there should be a folder named "boot" Run the following command:

cd boot/loader/entries

• There should be a ".conf" file. This could be named anything. In my case it is "arch.conf"

NOTE : You can use any text editor / CLI editor you like. Here I am using nano

nano arch.conf

• After opening the file edit these entries to the new one ( '->' = to)

linux /vmlinuz-linux -> linux /vmlinuz-linux-zen
initrd /initramfs-linux.img -> initrd /initramfs-linux-zen.img

• SAVE the file and exit
• Now we are done. Simply reboot and enjoy! :)

If you wish to contribute to this project, visit :

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.