If you want to be able to monitor libvirt virtual machines, install libvirt-bin on ubuntu or libvirt-clients on debian (beware: this pulls in a whole bunch of dependencies you otherwise probably wouldn't need on your server):
If you want to be able to monitor libvirt virtual machines, install libvirt-bin on ubuntu or libvirt-clients on debian (beware: this pulls in a whole bunch of dependencies you otherwise probably wouldn't need on your server):