Here's a log from a boot using your kernal at https://people.canonical.com/~khfeng/lp1814069/ Kernel parameters are as you requested and a modprobe hv_netvsc after boot.
I'm not sure exactly how to retrieve dmesg properly nowadays but I used journalctl -k -b -2 to retrieve the kernel messages for the boot we're interested in. If you need more detailed info give me a hint on how to retrieve it. ** Attachment added: "kernel messages from modprobe in 4.15.0-46" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1814069/+attachment/5245537/+files/dmesg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814069 Title: kernel linux-image-4.15.0-44 not booting on Hyperv Server 2008R2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1814069/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs