How to update sources.list in Lubuntu 15.10
This is very important if you wish to continue to use sudo apt-get install command. You will need to update the repositories now since Ubuntu.com has moved the Wily Werewolf packages to http://old-releases.ubuntu.com/ubuntu
If you try to follow the dir for the newer dists, you find it trailing ubuntu/ubuntu/ubuntu/ubuntu/ubuntu/ubuntu.. and can't use such.
In this video, I will demonstrate where you need to fix your sources.list file, how to edit such and what to save, what command to run next and how to fix your program packages updating issue.