I followed the setup procedure in https://help.ubuntu.com/community/KVM/Installation but after the following command:
$ virsh -c qemu:///system list
the system give me the following error:
error: unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: File or directory does not exist
I have the same error with VirtManager.
The system is Laptop çenovo T60 with UBUNTU 11.10 (32bit)