After applying a workaround to get rid of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1574869 the installation of Ubuntu Studio went through flawlessly (EFI secureboot PW type install) - so the error is gone on my system as well.
After applying a workaround to get rid of https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1574869 the installation of Ubuntu Studio went through flawlessly (EFI secureboot PW type install) - so the error is gone on my system as well.