Okay, First let me explain this: Linux Lite will be based on Ubuntu 16.04 LTS. This means whatever drawback Ubuntu 16.04 LTS experience, this will be experienced under LL 3.0 as well => LL 3.0 uses the same repositories as Ubuntu.
Secondly, Ubuntu 16.04 LTS will not support the AMD Catalyst (fglrx) driver,
read this article.
This means you need to use the open-source alternatives as can be read in the article.