Linux RealVNC Server 6 Licensing
This Tip Shows You How to Solve RealVNC Server 6 Licensing ‘Administrative Privileges are Required’ Issue on GNU/Linux Desktops.
Furthermore, to get it Working You will Need to Obtain at Least a RealVNC Server Free License Key for Private use that after can be Extended to Premium Personal/Business Features.
Finally, the Linked guide includes also instructions on How to Install RealVNC Client needed to Access RealVNC Screen Sharing.

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Linux RealVNC Server Initial Setup
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Then Run RealVNC Lincense Wizard
With Admin Privileges:sudo vnclicensewiz
Sign In into your RealVNC Account:
And Finally, your Subcription will be Confirmed! :)
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