Comment 2 for bug 1923865

Hey, making the ttyS0 change did enable the serial console, of course, but I'm still dropped into initramfs on ttyS0, whether importing the image into virt-manager or using your line (without seed.img).

My qemu line:

qemu-system-x86_64 \
  -cpu host -machine type=q35,accel=kvm -m 2048 \
  -snapshot \
  -netdev id=net00,type=user,hostfwd=tcp::22222-:22 \
  -device virtio-net-pci,netdev=net00 \
  -drive if=virtio,format=qcow2,file=xenial-test.qcow2

And after Ctrl+Alt+3:

Begin: Will now check file system ... fsck from util-linux 2.27.1
Checking all file systems.
done.
mount: can't find /root in /etc/fstab
done.
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... mount: mounting /dev on /root/dev failed: No such file or directory
done.
mount: mounting /run on /root/run failed: No such file or directory
run-init: current directory on the same filesystem as the root: error 0
Target filesystem doesn't have requested /sbin/init.
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
run-init: current directory on the same filesystem as the root: error 0
No init found. Try passing init= bootarg.

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)