So, after some fiddling around I started from scratch: updated BIOS, removed all HDs and started with one HD that was used as a VM volume. Luckily the disk that originated as a VM did boot from metal into the once guest system an now a host Windows10. IMHO - A great KVM ability.
Thanks to Steve and Tiago for your help! (and for a very interesting insight into the way secure boot works). I think the bug can be closed. ** Attachment removed: "fdisk_l" https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1575305/+attachment/4648358/+files/fdisk_l ** Attachment removed: "grep grub positive" https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1575305/+attachment/4648297/+files/alternatives.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1575305 Title: Ubuntu system broken after upgrade from 15.10 to 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1575305/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
