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If you have deployed a Windows Server 2012 R2 generation 2 virtual machine on 2012 R2 Hyper-V server you may find that Windows Update fails on any generation 2 virtual machines.
Generation 2 virtual machines use UEFI rather than BIOS. UEFI is a firmware interface to the hardware that will gradually replace BIOS on newer hardware. It is more secure than BIOS and designed to protect pre-boot prcesses from attack, improve startup times and support larger disks, as well as a number of other enhancements.
So a Generation 2 virtual machine uses UEFI, and therefore has the Enable Secure Boot option enabled by default.
Below are lots of WindowsUpdateClient event id 20 error messages. I recieved on my first generation 2 virtual machine.
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To resolve the issue, turn off Secure Boot, update the server and then re-enable Secure Boot after.
Shutdown the virtual machine in question, then select Settings.
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Click Firmware, then unselect Enable Secure Boot tick box.
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Next, run Windows Update, patch the server and once the updates are completed, shutdown the server so you can re-enable the Secure Boot option.
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Related Posts:
1. How to enable Data Deduplication in Windows 2012
2. How to enable Windows 8.1 Windows 2012 R2 dual boot – boot to VHD
3. Windows Server 2012 Hyper-V Best Practices
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