CPUID.01H:ECX.vmx boot message - Cannot start VM

I created a new Ubuntu 16.04.2 VM and it booted nicely from CD image.
When rebooting after successful installation, the VM hangs, and boot message shows:
warning: host doesn’t support requested feature: CPUID.01H:ECX.vmx [bit 5]

All previously installed VMs work fine.

I am running
Webmin version 1.840
Cloudmin version 9.2.kvm
Operating system Ubuntu Linux 16.04.1
Processor information AMD FX-8320E Eight-Core Processor, 8 cores
Kernel and CPU Linux 4.4.0-77-generic on x86_64

Does anybody know how is it possible to fix this?