The HD 6000 series GPU were made legacy in 2015 which means there will be no AMD driver updates since that time.
So unless you can install the Ubuntu Driver from version 14.04 to your latest version I don't see a way to get your driver installed.
Also does your laptop have a AMD or Intel APU processor? if AMD then you need to upload the AMD APU integrated Graphics which will install both the IGPU and DGPU in laptop.