sudo apt install virt-manager isomaster

Config files:
/etc/libvirt/

Image files:
/var/lib/libvirt/images/

Transfer files to VM:
Create an ISO file with isomaster.

Mount ISO image:
mount stuff.iso /mnt
mount -t iso9660 -o loop stuff.iso /mnt
umount /mnt

Start NAT network:
1. Open Virtual Machine Manager.
2. Edit → Connection Details → Virtual Networks.
3. Click 'Start Network' button at the bottom left corner.

Add USB printer:
1. Connect and turn on the printer.
2. Open Virtual Machine Manager.
3. Select GUEST system.
4. Click 'Open' button.
5. Click 'Show virtual hardware details' button.
6. Click 'Add Hardware' button.
7. Click 'USB Host Device'.
8. Select 'HP LaserJet 1020 Printer'.