Ubuntu 16.04
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SPICE Server
Install Desktop Virtualization "SPICE ( Simple Protocol for Independent Computing Environment )". It's possible to connect to virtual machines from remote client computer.
[1] Edit existing virtual machine's xml-file and start virtual machine with SPICE. This site's example has created virtual machine without graphics, so it's OK to change settings like follows, but if you created virtual machine with graphics, Remove "<graphics>***" and "<video>***" sections in xml file because qxl is used for graphics.
# edit the configration for a virtual machine

virsh edit ubuntu1604
<domain type='kvm'>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>2</vcpu>
# add follows to appropriate sections

# set any password for "passwd=***", set uniq number for "slot=***"

    <graphics type='spice' port='5900' autoport='no' listen='' passwd='password'>
      <listen type='address' address=''/>
      <model type='qxl' ram='65536' vram='32768' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

Domain ubuntu1604 XML configuration edited.

# start VM

virsh start ubuntu1604

Domain ubuntu1604 started