virtmanager - libvirtdデーモンが見つかりません

Virt-managerを起動しようとしていますが、このエラーが発生します。

Unable to connect to libvirt.

internal error: Unable to locate libvirtd daemon in /usr/sbin (to override, set $LIBVIRTD_PATH to the name of the libvirtd binary)
Hi, I tried to start virtmanagerr (installed via mint software center)
but get this?

    Libvirt URI is: qemu:///system

    Traceback (most recent call last):
      File "/usr/share/virt-manager/virtManager/connection.py", line 1027, in _open_thread
        self.vmm = self._try_open()
      File "/usr/share/virt-manager/virtManager/connection.py", line 1009, in _try_open
        flags)
      File "/usr/lib/python2.7/dist-packages/libvirt.py", line 102, in openAuth
        if ret is None:raise libvirtError('virConnectOpenAuth() failed')
    libvirtError: internal error: Unable to locate libvirtd daemon in /usr/sbin (to override, set $LIBVIRTD_PATH to the name of the libvirtd binary)