Hyper-v - Virtual Machine could not be started because the hypervisor is not running ... But it is

Question

I've seen various threads on this subject but none of them solve the issue I have. I want to be able to run Docker for Windows on this machine but even though it installs i get a problem at start up. The problem appears to be nothing to do with Docker, as no VM will start.

For reference, I did successfully run Hyper-v when I first got the machine (late 18) and ran Docker for Windows OK. But I had to go back to VirtualBox for a while and now that I can go back to hyper-v I find I get the problem.

Machine is a Lenovo Thinkpad P51 with 32GB memory, running Windows 10

bcdedit reports:

hypervisorlaunchtype    Auto

systeminfo reports:

Hyper-V Requirements:      VM Monitor Mode Extensions: Yes
                           Virtualization Enabled In Firmware: Yes
                           Second Level Address Translation: Yes
                           Data Execution Prevention Available: Yes

The services - I think this is correct:

The Windows features show as installed:

Where am I going wrong ? Any other logs/messages that i can look at ?

FWIW - I can disable Hyper-V and run VirtualBox without any issues....

Answer 1

As per the suggestion from @Ramhound i checked the Windows version and as it was old 1803 I did the upgrade to the new 1903 (May19) build.

This has fixed the VM startup problem and i'm now working again.

The fix may be that the update fixed a configuration problem during the update or it may have fixed a bug. Either way i'm working again.