Unable to complete install: 'internal error: process exited while connecting to monitor: Error: Cirrus VGA not available '

[Joe Zhao]

on Ubuntu 14.04.5 LTS, trying to create a virtual machine for qemu/linux/armv7l. The following errors are shown.

Unable to complete install: 'internal error: process exited while connecting to monitor: Error: Cirrus VGA not available
'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 96, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/create.py", line 1983, in do_install
    guest.start_install(False, meter=meter)
  File "/usr/lib/python2.7/dist-packages/virtinst/Guest.py", line 1246, in start_install
    noboot)
  File "/usr/lib/python2.7/dist-packages/virtinst/Guest.py", line 1314, in _create_guest
    dom = self.conn.createLinux(start_xml or final_xml, 0)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3202, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error: process exited while connecting to monitor: Error: Cirrus VGA not available