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Open Terminal
Run "sudo apt-get update" to update the source list.
Now Run "sudo apt-get install linux-generic-lts-xenial" and If Your system asks for confirmation to proceed, Press "y" to continue the installation process.
Wait few minutes.. it will take some time to download the required packages..
You are almost done..!
That's it ! Now reboot to use Nwely installed kernel. Enjoy !!