Hi. This is not a question, I had the following problem and I want to share my solution. ------- I tried to create a new virtual machine with this command: $ virt-install --connect qemu:///system -n vmTeste -r 512 -f /var/lib/libvirt/images/vmTeste.qcow2 -s 2 -c /media/Data/isos/debian-506-amd64-netinst.iso --vnc --noautoconsole --accelerate --hvm And I got this error: ERROR Unable to deny all devices for vmTeste: No such file or directory Traceback (most recent call last): File "/usr/bin/virt-install", line 1033, in <module> main() File "/usr/bin/virt-install", line 915, in main start_time, guest.start_install) File "/usr/bin/virt-install", line 957, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 973, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1038, in _do_install "install") File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1009, in _create_guest dom = self.conn.createLinux(start_xml, 0) File "/usr/lib/python2.6/dist-packages/libvirt.py", line 1277, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: Unable to deny all devices for vmTeste: No such file or directory I found the same error looking for in the internet, similar errors including in this list. I tried to solve changing permissions, editing xml and defining the virtual machine, etc. No long time ago I made some changes to optimize kernel performance for desktop as described here (it's in Portuguese, but can be undertood reading the commands and files) and this changes caused the above errors (in Ubuntu 10.10 and Fedora 14). I undid the changes and I had no more errors. Possibly I can be wrong, but it worked for me. __ *Lucas Arbiza* email: lucas.arbiza@gmail.com celular: +55 (55) 9152 7561 Twitter: http://twitter.com/lucasarbiza Facebook: http://www.facebook.com/lucas.arbiza Google Profile: http://www.google.com/profiles/lucas.arbiza <http://www.google.com/profiles/lucas.arbiza>LinkedIn: http://br.linkedin.com/in/lucasarbiza