$ sudo apt install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils
$ kvm-ok

$ sudo apt install virt-manager

$ sudo qemu-img create -f qcow2 /var/lib/libvirt/images/test-vm.qcow2 30G

$ sudo apt install samba

$ sudo nano /etc/samba/smb.conf

[Public]
  comment = Public shared folder
  path = /path/to/public/folder
  read only = yes
  guest ok = true
  acl allow execute always = true

$ testparm
$ sudo service smbd restart