AMD Radeon R7-450 graphics card driver for ubuntu 16.04.2 LTS

Hi, Recently, I purchased dell cpu with "AMD Radeon R7-450" graphics card. I installed ubuntu16.04 and windows10 OS in my system for my research work. I found amd graphics card driver from the dell site for windows10 but I didn't find any driver for ubuntu16.04. Due to this, the text on my screen is large and feeling uneasy to work in ubuntu with weird font size and distorted images. Please suggest any possible solution for this problem.

 

Thanks.

 

Regards

G Thyagarajulu,

IITB.