looks like wrong target, not uefi amd64

[William]

oot@ubuntu:/# grub-install --target=x86_64-efi --uefi-secure-boot --efi-directory=/boot/efi /dev/sda
grub-install: error: /usr/lib/grub/x86_64-efi/modinfo.sh doesn't exist. Please specify --target or --directory.
root@ubuntu:/# uname -r
5.3.0-18-generic

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CasperVersion: 1.427
Date: Tue Jan 21 05:10:58 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)