Meanwhile, the performance of the box will be improved a lot after the upgrade.
Step 1 :
sudo apt-get updateStep 2 :
sudo apt-get install linux-generic-lts-xenial linux-headers-generic-lts-xenial linux-image-generic-lts-xenial linux-tools-generic-lts-xenialStep 3 :
sudo apt-get remove linux-image-generic-lts-utopic linux-headers-generic-lts-utopic linux-image-generic-lts-vivid linux-headers-generic-lts-vividStep 4 :
sudo apt-get autoremove
sudo apt-get autocleanStep 5 :
sudo update-grubStep 6 :
Reboot your box.
REMARK
If you are running Croissants (IPS) on Ubuntu 14.04 LTS, you can upgrade the Kernel to 4.4.0 as well. You just follow the captioned steps.
That's all! See you.
