Package: libvirt-daemonVersion: 12.0.0-1 Severity: grave I'm not sure I know exactly what's going on here. I marked this bug as grave at it makes KVM completely unusable unless you don't use networking. I believe Debian unstable moved from iptables to nftables a while ago, which broke libvirt networking. I've been getting around that by using an older kernel (6.17.x, don't remember exactly which one) but that stopped working after I upgraded yesterday.
I get the following error when I try to start the default (NAT) network: $ sudo virsh net-start default error: Failed to start network default error: internal error: Failed to run firewall command iptables -w --table filter --list-rules: Running that command manually I get: $ sudo iptables -w --table filter --list-rules modprobe: FATAL: Module ip_tables not found in directory /lib/modules/6.18.12+deb14-rt-amd64 iptables v1.8.12 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. Again, I'm not sure exactly what's going on here. It's possible this issue was already reported, but I couldn't find it.
