Ubuntu KVM multiple monitors

 On Ubuntu 20.04

Learn From

• Link

 Steps

Add one more Video QXL 

 

Set Display Spice and open port for example 5907

 Start VM without using virt-manager graphical console

Finally, you need to use remote-viewer and open up the guest firewall:

You may try directly remote-view the instance first, if not work, you may add the firewall steps

$ sudo apt-get install firewalld
$ sudo firewall-cmd --permanent --add-service=vdsm
$ sudo firewall-cmd --reload
$ remote-viewer spice://localhost:5907