Unfortunately, I was to fast, the workaround does not work so I had to go back on 4.14, but i am sure that you can copy the stuff together. I tried a similar procedure a few weeks ago.
> Kernel: Linux 4.14.0-3-amd64 (SMP w/4 CPU cores) > Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), > LANGUAGE=de_DE.UTF-8 (charmap=UTF-8) > Shell: /bin/sh linked to /bin/dash > Init: systemd (via /run/systemd/system) > LSM: AppArmor: enabled >