The uki kernel went in via a dependency, if I remember correctly via VirtualBox, but I cannot trace it back anymore. may be the dependency is gone. It works fine in qemu-kvm, where you can boot it from efi directly. Since the uki kernel is designed to be started by UEFI directly, it has to reside in the EFI partition, because without additional drivers UEFI can only read VFAT. This partition could be too small for it. You can safely remove the package, but it could come back…