[Azure Devops] Facing error message in Azure Pipeline: Unable to init server: Could not connect: Connection refused and how to resolve it?

Issue:

Keep facing error message in Azure Pipeline as below:

"Unable to init server: Could not connect: Connection refused
Katalonc: Cannot open display"

Solution:

Using vmImage: ubuntu-18.04 instead of 16.04. Configure Xvfb-run as the below: