Is my graphics driver not compatible with Ubuntu 15.10?

My system is an eight-year old desktop. It has the following configuration.

System Configuration

I am using an LG Flatron E2042 Monitor. During work, the screen starts flickering frequently. It looks like this:

Flickering Screen

Today, I got the following error message:

fsck from util-linux 2.26.2
/dev/sda1: clean...
[OK] Started Light Display Manager.
[OK] Started ACPI event daemon. 

What could be the most probable cause of such an error?

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