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I'm following the steps below to create a virtual machine using Xen as hypervisor and virt-manager (libvirt) as the management module. When trying to create the virtual machine I am getting the following error:

Unable to complete install: 'internal error: unsupported input bus usb'

ERROR DETAILS:

Unable to complete install: 'internal error: unsupported input bus usb'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/create.py", line 2276, in _do_async_install
    guest.start_install(meter=meter)
  File "/usr/share/virt-manager/virtinst/guest.py", line 461, in start_install
    doboot, transient)
  File "/usr/share/virt-manager/virtinst/guest.py", line 397, in _create_guest
    domain = self.conn.createXML(install_xml or final_xml, 0)
  File "/usr/lib/python3.7/site-packages/libvirt.py", line 3717, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirt.libvirtError: internal error: unsupported input bus usb

NOTE I: The deploy process follows the instructions here https://www.youtube.com/watch?v=BwkmDM-Gpzc and here https://wiki.centos.org/HowTos/Xen/Xen4QuickStart .
NOTE II: Xen Hypervisor uses a CentOS 7 as "domu".


STEPS:

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1

I updated my version and the problem no longer occurred!

Here's what Cole Robinson replied to me on the "libvirt-users" mailing list (libvirt-users@redhat.com):

Coincidentally this a bug I fixed just this morning:

commit b1eb07c26aae1b303cd9893427f46f5b693544b3 (HEAD -> master, 
origin/master, origin/HEAD)
Author: Cole Robinson <crobinso@redhat.com>
Date:   Wed Aug 22 08:38:33 2018 -0400

     guest: Don't add usb tablet for xen PV

     xen PV doesn't have USB support


But you can work around it: at the end of the 'new vm' wizard, click 
'customize before install', and in the VM details window, remove the 
tablet device, then finish the install. That should make things work

Thank you! =D

NOTE: https://github.com/virt-manager/virt-manager/blob/master/INSTALL.md

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