On the kvm kernel, CONFIG_IP_MULTICAST is not set which breaks some apps

[David Monro]

I was trying to run minidlna in docker on a kvm VM built using the minimal image, and it wasn't working properly; eventually I tracked this down to the lack of ipv4 multicast support in the kvm kernel rendering it unable to join the SSDP multicast group (239.255.255.250). Replacing the kernel with the generic one solved the problem (which was itself non trivial because of https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1870189 causing the system not to load the initramfs needed by the generic kernel).

Does the kernel multicast code really need to be removed for the kvm kernel?