Added Windows Server 2019 Hyper-V roles
Summary: This section describes how to add roles for Hyper-V.
Instructions
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Log on with an account with administrative rights and start Server Manager.

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Click Add Roles and Features from the Manage menu at the top right of the screen.

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On the Before You Start page, verify that the prerequisites for the roles and features you want to install are in place, and then click Next.

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On the Select Installation Type page, select Role-based or Feature-based Installation, and then click Next.

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On the Select Target Server page, select Select Server from Server Pool, select the server where you want to install Hyper-V in the Server Pool field, and then click Next.

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On the Select Server Role page, select Hyper-V.

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On the Add Required Features page, click Add Features.

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When you return to the Select Server Roles page, click Next.

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On the Select Features page, click Next as is.
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On the Hyper-V page, click Next as is.
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On the Create Virtual Switch page, click Next as is.
*Since virtual switches can be created in hyper-V manager after HYPER-V installation, hyper-V is installed without creating a virtual switch.
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On the Migrate Virtual Machines page, select the appropriate option if necessary.
Here, select nothing and click Next as it is.
*After hyper-V installation, you can change the settings in hyper-V manager.
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On the Default Location page, set the appropriate location as needed.
Here, click [Next] without setting anything.
*After hyper-V installation, you can change the settings in hyper-V manager.
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On the [Confirm installation options] page, click [Install].

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When you see "You need to restart the target server and complete the installation", click Close to restart the server.

That's it.