I have got the next error information after try run a QEMU/KVM virtual machine on Virt-Manager:
```
Error al iniciar dominio: internal error: child reported: Kernel does not provide mount namespace: Permiso denegado
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb
callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 82, in newfn
ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1508, in startup
self._backend.create()
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1080, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error: child reported: Kernel does not provide mount namespace: Permiso denegado
```
I have no problem 2 days ago. Mybe it is due a kernel upgrade?