plz help me cuz i dont know howe to install grub properly in order ton my 2 operative systeme

[Dje Bi gauley cyrille dorgeles]

plz help me

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.6
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
Date: Fri Feb 8 23:09:03 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-MATE 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Seth Arnold (seth-arnold)]

Hello, it looks like there's no EFI partition, but an EFI install was attempted:

Feb 8 23:08:30 ubuntu-mate ubiquity: grub-install : erreur : impossible de trouver le répertoire EFI.
Feb 8 23:08:30 ubuntu-mate ubiquity: dpkg: error processing package grub-efi-amd64-signed (--configure):
Feb 8 23:08:30 ubuntu-mate ubiquity: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Feb 8 23:08:31 ubuntu-mate ubiquity: Errors were encountered while processing:
Feb 8 23:08:31 ubuntu-mate ubiquity: grub-efi-amd64-signed
Feb 8 23:08:33 ubuntu-mate ubiquity: E: Sub-process /usr/bin/dpkg returned an error code (1)

Thanks