grub-common 2.06-2ubuntu15 (s390x binary) in ubuntu lunar

 This package contains common files shared by the distinct flavours of GRUB.
 It is shared between GRUB Legacy and GRUB 2, although a number of files
 specific to GRUB 2 are here as long as they do not break GRUB Legacy.
 .
 grub-mkrescue needs the suggested packages mtools (for UEFI targets) and
 xorriso.