This SharePoint 2016 tutorial explains, how to resolve the error “An exception of type System.InvalidOperationException was thrown. Additional exception information: An error occurred while getting information about the user Bijay at server SPSky.com: The RPC server is unavailable” which comes while installing and configuring SharePoint 2016.
The error comes after installing and configuring SharePoint 2016. You can see the below screenshot for more information.

If you will see the log file, you can see the full message
The RPC server is unavailable
This is a known issue in the SharePoint server 2016 and Microsoft has already released a security update for this issue. Download and Install the Security update from the below URL.
Then restart the machine and run SharePoint 2016 Products Configuration Wizard again and this time the error will not come.
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I hope this tutorial, will be helpful to fix error The RPC server is unavailable which comes while installing SharePoint 2016.
I am Bijay a Microsoft MVP (8 times – My MVP Profile) in SharePoint and have more than 15 years of expertise in SharePoint Online Office 365, SharePoint subscription edition, and SharePoint 2019/2016/2013. Currently working in my own venture TSInfo Technologies a SharePoint development, consulting, and training company. I also run the popular SharePoint website EnjoySharePoint.com
very nice article keep up the good work