If you install gnom-boxes libvirt will only allow root by default.
to allow regular users you need to create the libvirt group and allow access to the libvirt daemon.
# Install boxes
root@zenbook /home/user # eopkg install gnome-boxes
# Enable the libvirt service
root@zenbook /home/user # systemctl enable libvirtd.service
# Add libvirt group
root@zenbook /home/user # groupadd libvirt
# Add ‘user’ to the libvirt group
root@zenbook /home/user # usermod -a -G libvirt user
#To allow libvirt group access to boxes edit the libvirt daemon
root@zenbook /home/user # nano /etc/libvirt/libvirtd.conf
unix_sock_group = “libvirt”
unix_sock_ro_perms = “0770”
unix_sock_rw_perms = “0770”
auth_unix_ro = “none”
auth_unix_rw = “none”
# Save; then restart the daemon
root@zenbook /home/user # systemctl restart libvirtd.service