apt-get install -y bridge-utils
nano /etc/network/interfaces

allow-hotplug eth0
iface eth0 inet manual

auto br0
iface br0 inet static
  address 192.168.1.20
  netmask 255.255.255.0
  broadcast 192.168.1.255
  gateway 192.168.1.1
  bridge_ports eth0
  bridge_stp off
  bridge_fd 0
  bridge_maxwait 0
  dns-nameservers 192.168.1.9

sed -i s/GRUB_TIMEOUT=5/GRUB_TIMEOUT=2/ /etc/default/grub
update-grub
apt-get install -y sudo
echo "" >> /etc/sudoers
echo "user ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
echo 'Package: xdg-user-dirs' >> /etc/apt/preferences.d/xdg-user-dirs
echo 'Pin: origin ""' >> /etc/apt/preferences.d/xdg-user-dirs
echo 'Pin-Priority: -1' >> /etc/apt/preferences.d/xdg-user-dirs

groupadd spice
usermod -a -G spice user
nano /etc/udev/rules.d/50-spice.rules

SUBSYSTEM=="usb", GROUP="spice", MODE="0660"
SUBSYSTEM=="usb_device", GROUP="spice", MODE="0660"

nano /usr/share/polkit-1/actions/org.spice-space.lowlevelusbaccess.policy

<allow_any>yes</allow_any>

reboot

apt-get install -y xorg xfdesktop4 xfwm4 xfce4-panel xfce4-settings xdm
apt-get install -y xfce4-session --no-install-recommends
apt-get install -y thunar thunar-volman gvfs policykit-1 lxterminal
apt-get install -y qemu-kvm libvirt-clients libvirt-daemon-system virtinst libvirt-daemon virt-manager \
  qemu-utils spice-client-gtk gir1.2-spiceclientgtk-3.0 --no-install-recommends
usermod -a -G libvirt user
reboot