Why vnc service failed with "A vnc server is already running on :N" despite there is no vnc service running?

Solution Verified - Updated 2017-11-29T12:03:54+00:00 -

Issue

Why vncserver@:1.service is not starting on the system?
Why is vncserver able to start on :2 display but not on :1, vncserver@:n.service failed with A vnc server is already running on :N

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