Are you using libvirt system session or user session? If you use system session you most probably don't want to store disk images in the home directory of some individual user? If you use system session you can right click "QEMU/KVM" and choose Details->Virtual networks to configure networks. The default network uses virbr0 and NAT so you don't need do anything in etc/network/interfaces.
Statistics: Posted by lindi — 2025-02-08 20:44