can't install grub efi amd64 fail

[jotis pana]

I can't install Lubuntu. I get the grub-efi-amd64-signed failed installation message. Tried already three times... Thnx
I am a newbie using linux. I think i am trying to install a 16.04 version. My laptop had already windows 10.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.4
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic i686
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: i386
CasperVersion: 1.376.2
Date: Mon Jul 30 21:41:58 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Lubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)