Problem
After upgrading my LAB to VMM 1801, and subsequently VMM 1806 (see https://lokna.no/?p=2519), VMs refuse to start on one of my hosts. EventID 20148 was logged when I tried to create a new VM. I restarted the host in hope of a quick fix, but the result was that none of the VMs living on this host wanted to boot.
Virtual machine ‘NAME’ could not be started because the hypervisor is not running”
Solution
For some reason the Hypervisor has been disabled. You can check this by running BCDEDIT in an administrative command prompt. The hypervisorlaunchtype should be set to Auto. If it is not, change it by running the following command:
bcdedit /set hypervisorlaunchtype auto
After that, reboot the host and everything should be running again. Unless, of course, you have a completely different issue preventing your VMs from starting.
