As to why it takes virtio block driver changes for /dev/disk/by-id to work compare
sudo sg_vpd --page=0x80 /dev/sda with sudo sg_vpd --page=0x80 /dev/vda -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/604335 Title: grub-pc.postinst script fails to detect virtio vda disk in KVM guest To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/604335/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs