Libvirt virsh : Error starting network, cannot execute binary /usr/sbin/iptables

Hi, I am a bit lost and hope someone can help me. I am running Debian bookworm (testing) with last updates. $ sudo apt policy libvirt-daemon libvirt-daemon:   Installé : 8.5.0-1   Candidat : 8.5.0-1  Table de version :  *** 8.5.0-1 100         100 /var/lib/dpkg/status I am unable to start default network , and get an error related to iptables : $ sudo virsh net-start default erreur :Impossible de démarrer le réseau default erreur :internal error: Failed to apply firewall rules /usr/sbin/iptables -w --table filter --list-rules: libvirt:  erreur : cannot execute binary /usr/sbin/iptables: Aucun fichier ou dossier de ce type Sorry for the french, it says "impossible to start default network" and "no such file or folder" at the end. It is true I removed iptables because I want to use only nftables (I removed both ufw and iptables packages (apt remove), and enabled the nftables service before error raises). Before this, all was fine, but when I enabled nftables, all VMs disapeared  from virt-manager). I uninstalled KVM related packages and reinstalled, still the same. I also installed back iptables, but strangely I still get the same error, although binary /usr/sbin/iptables is there. I tried many things with no luck, restarted libvirtd service, recreated the network, etc... Has anyone some idea about what is happening here ? is there some incompatibility with nftables (firewalld service is disabled) and libvirt ? Thank you, Pascal