sudo apt-get install libvirt-daemon-system bridge-utils
This should install a number of packages as dependencies, including qemu-kvm.
Now logout and log back in again as the "nsrc" user. Check that you are in
the "libvirt" group using the
nsrc@brian-kit:~$ id uid=1000(nsrc) gid=1000(nsrc) groups=1000(nsrc), ... 118(libvirt)
(the actual number may be different). If not, then add yourself to this group:
sudo usermod -a -G libvirt nsrc
Logout and login again, and check with
Disable KVM halt polling
Edit or create
/etc/modprobe.d/qemu-system-x86.conf and add the following
options kvm halt_poll_ns=0
Check that your system supports KVM (hardware-accelerated virtualization):
If the result says that your CPU does not support KVM extensions, then you need to investigate the problem. Check your BIOS settings, and ensure that "VT-x" (Intel) or "AMD-V" is enabled.