How to fix Server Manager Errors after installing updates (HRESULT:0x800F0818 / HRESULT:0x800B0100)

Symptoms You install several Updates. After the successful installation, you notice you cannot add or remove features/roles in the Server Manager. Error: Unexpected error refreshing Server Manager: Exception from HRESULT:0x800F0818 Alternatively you can also get: Server Manager: Unexpected error refreshing Server Manager: No signature was present in the subject. (Exception from HRESULT: 0x800B0100) Resolution First…

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