I'm using Kubuntu 18.04 LTS with an AMD Athlon X4 processor and ATI Radeon HD 3000 graphics. In system settings when I tried to find additional drivers it said my system doesn't have proprietary drivers. So I tried installing the drivers from their official website, and it gave me the next error:
error: Detected X Server version 'XServer _64a' is not supported. Supported versions are X.Org 6.9 or later, up to XServer 1.10 (default:v2:x86_64:lib:XServer _64a:none:4.15.0-42-generic:)
Installation will not proceed. Removing temporary directory: fglrx-install.qpSwsW
How can I install the drivers?