There is a boot message "MODSIGN: Couldn't get UEFI db list: EFI_NOT_FOUND". What might be causing this problem? Should I care about it? Is there anything to be done?

The boot process continues with some ACPI warnings concerning systemIO range conflicts with OpRegions ( \_SB_.PCI0.LPC_.PMIO and \_SB_.PCI0.LPC_.LPIO). SLED woks fine.

The partitions /boot/efi, type vfat, and /boot/grub2/x86_64-efi, type btrfs, both look ok.

Local environment: Lenovo T520, Type 4243F53, Architecture: x86_64, Kernel Version: 4.4.156-94.61-default, Last Updated Package: Do 18 Okt 2018 14:44:41 CEST.

Thank you.