New info. When was chatting with the KVM developers, they told me about some bug on CentOS.. This was the reason for the error..
But, since some weeks ago I had been using this repo: https://launchpad.net/~dnjl/+archive/virtualization And, in one of the last updates of virt-manager the bug has gone.. So.... The problem is on virt-manager.. -- Unable to run Virtual Machine https://bugs.launchpad.net/bugs/217311 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs