dual boot installation, win10 not recognized, partition manually created, install failed during GRUB installation

[Isaias Ullmann Thoen]

Isa_thoen

system fail during grub installation on a computer with win10.
linux didn't found win10 as an OS previously installed.
I created manually two partitions to install lubuntu (/ and /home as ext4)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Fri Dec 14 14:54:40 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/lubuntu.seed boot=casper only-ubiquity iso-scan/filename=/WinUSB/CFD7F09C-BFAE-4272-9515-89C5DB2B344F/lubuntu_18.04_desktop_amd64.iso quiet splash ---
LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=pt_BR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)