Ubuntu 22.04 not internet, but internet works

Support and Help
5

hi

Your resolvecfg is foreign, so not the systemds’ handling. If you are not using a custom DNS manger then revert to that maybe?

sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
sudo systemctl restart systemd-resolved

You could try enabling routed traffic
now disabled: Default: deny (incoming), allow (outgoing), deny (routed)
enable: sudo ufw default allow routed

Try launching your quemu:

qemu-system-x86_64 \
  -enable-kvm \
  -m 4096 \
  -cpu host \
  -smp 4 \
  -hda /path/to/your/windows.img \
  -netdev bridge,id=net0,br=br0 \
  -device virtio-net-pci,netdev=net0 \
  -display gtk

NOTE:
Your IP6 traffic is wide open: Anywhere (v6) on br0 ALLOW IN Anywhere (v6)