Q:

Stuck with end of life ubuntu 15.04

My old windows xp was giving me lot of problem so I thought of installing ubuntu.  I searched for ubuntu and found out that latest released version required 2gb of ram but I have only 1 gb ram.  So I searched for old release ubuntu and downloaded 15.04 vivid version and then replaced windows xp with this.  Now I came to know that it's end of life for vivid and I am unabel to download and install any software on this ubuntu 15.04.  Now I want to use linux lite latest version how can I do that .I don't have any other laptop or pc other than this. 

A:

Possible duplicate of How to install software or upgrade from an old unsupported release? 
You need to change your apt sources list and change the current Ubuntu domains to old-releases.ubuntu.com
After that, you can install update-manager and do do-release-upgrade. 
You will first upgrade to 16.04, and if you want to, from there you can continue to upgrade to 18.04. 