# debian approach:
-shimx64.efi.signed = /usr/lib/shim/shimx64.efi.signed from http://ftp.de.debian.org/debian/pool/main/s/shim-signed/shim-signed_1.33+15+1533136590.3beb971-7_amd64.deb
-grubx64.efi.signed = /usr/lib/grub/x86_64-efi-signed/gcdx64.efi.signed from http://ftp.de.debian.org/debian/pool/main/g/grub-efi-amd64-signed/grub-efi-amd64-signed_1+2.02+dfsg1+20_amd64.deb
+shimx64.efi.signed = /usr/lib/shim/shimx64.efi.signed from https://deb.debian.org/debian/pool/main/s/shim-signed/shim-signed_1.38+15.4-7_amd64.deb
+grubx64.efi.signed = /usr/lib/grub/x86_64-efi-signed/gcdx64.efi.signed from https://deb.debian.org/debian/pool/main/g/grub-efi-amd64-signed/grub-efi-amd64-signed_1+2.06+7_amd64.deb
# NOTE:
# shimx64.efi.signed ends up as /EFI/BOOT/bootx64.efi inside [grml_cd]/boot/efi.img, and
# grubx64.efi.signed ends up as /EFI/BOOT/grubx64.efi inside [grml_cd]/boot/efi.img, whereas