[SOLVED] Unable to connect to libvirt internal error: Cannot find suitable emulator for x86_64

Somehow, after updating to Kubuntu 16.04, KVM can not been started with error:

Unable to connect to libvirt.

internal error: Cannot find suitable emulator for x86_64

Libvirt URI is: qemu:///system

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/connection.py", line 977, in _open_thread
self._populate_initial_state()
File "/usr/share/virt-manager/virtManager/connection.py", line 939, in _populate_initial_state
logging.debug("conn version=%s", self._backend.conn_version())
File "/usr/share/virt-manager/virtinst/connection.py", line 316, in conn_version
self._conn_version = self._libvirtconn.getVersion()
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3889, in getVersion
if ret == -1: raise libvirtError ('virConnectGetVersion() failed', conn=self)
libvirtError: internal error: Cannot find suitable emulator for x86_64


I was originally trying to reinstall KVM with this Wiki:
https://help.ubuntu.com/community/KVM/Installation

but was stuckt in a step
Here are output of lsmod | grep kvm

I have found several quazi [SOLVED] forms but with no real solution.

Any help appreciated. Thanks!