Update (Offline) Ubuntu 16.04 Kernal to Latest Version

Recently I was experiencing Wifi connectivity issue on my Ubuntu 16.04. It was running on Ubuntu 16.04 kernal version 4.4.0.x. Even though #lspci command output showed the presence of WiFi Network card, it was not detected by the Ubuntu Network Manager. After couple of trial and error attempts, I decided to upgrade the Ubuntu Kernal to a latest stable version. However due to not having Internet connectivity, I decided to  do it offline. Below are the steps I followed.

To detect the presence of Wifi hardware, I used #lspci command. lspci is s utility for displaying information about PCI buses in the system and devices connected to them.

#lspci
..........
01:00.0 Network controller: Intel Corporation Wireless 3165 (rev 79)
..........

In order to start with offline kernal upgrade, first the required kernel version needs to be downloaded. It can be downloaded from Ubuntu website. To see what kernel versions are available for installations type this into your browser address bar:

http://kernel.ubuntu.com/~kernel-ppa/mainline/ 

After deciding the kernel version 4.10.0 to be installed, I downloaded the below listed .deb packages. I didn't want "low latency" just "generic" plus "all".


http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-headers-4.10.0-041000_4.10.0-041000.201702191831_all.deb
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-headers-4.10.0-041000-generic_4.10.0-041000.201702191831_amd64.deb
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-image-4.10.0-041000-generic_4.10.0-041000.201702191831_amd64.deb

I wanted to install the 64bit edition. Therefore I downloaded above three packages. Depending on your requirement, you may also need to download three packages (two header packages and one image package).

Given that you have the internet connectivity, you can download them using #wget utility.
cd /tmp
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-headers-4.10.0-041000_4.10.0-041000.201702191831_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-headers-4.10.0-041000-generic_4.10.0-041000.201702191831_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/linux-image-4.10.0-041000-generic_4.10.0-041000.201702191831_amd64.deb

After downloading the above three packages. I entered the below command to installed them. You need to be inside the folder which contain above three *.deb packages..
#sudo dpkg -i *.deb

Upon completion of the installtion process. I updated the Grub using below command.
#sudo update grub

Remember manually installed Kernels like I've just done, are not automatically deleted by Ubuntu. Ubuntu automatically deletes older kernel versions it installs only keeping the current version and the version previous to it. Therefore monitor the size of your /boot directory and periodically remove kernels you manually installed and no longer need. Don't use rm (remove) command, follow instructions found using google.

In addition to the above method, if you have the internet connectivity, Using Ukuu (which stands for ‘Ubuntu Kernel Update Utility’) is another way to do it. This straightforward desktop app help you install a new kernel in Ubuntu, Linux Mint, and other Ubuntu-based distributions, using the “mainline” kernels published by Canonical.