The cause for this VM error may originate from a qemu bug where a configured default sound card model is not recognized.
Unable to complete install: 'unsupported configuration: hda-duplex not supported in this QEMU library'
To solve this problem, do the following.
Solution One: Virt-Manager
On virt-manager, open the VM's virtual hardware details menu, go to sound device section, and change the device model from default to ac97.
Click on "Apply" button to save the change. See if you can start the VM now.
Solution Two: Virsh
If you are using virsh, not virt-manager, you can edit the VM's XML file accordingly. Look for sound section inside <device> section, and change the sound model to ac97 as follows.
<devices> . . . <sound model='ac97'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> . . . </device>
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