Ubuntu 16.04.2.LTS install in dual-boot with Windows10

[d52fr]

ASUS K756UQ-T4329T newly bought
Windows 10 installed and working
place done on SSD 256 (sdb) Go for / ; (Windows and efi partitions are there)
place done on HDD 1 To (sda) for /home and swap (16 Go)
installation going on until bug during process, far after logging data entry

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.3
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic i686
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: i386
CasperVersion: 1.376.2
Date: Mon Jun 5 16:13:30 2017
InstallCmdLine: BOOT_IMAGE=(hd0,gpt4)/casper/vmlinuz boot=casper quiet splash toram persistent --
LiveMediaBuild: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release i386 (20170215.2)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[d52fr (d52fr)]

Install from an USB stick (32 Go) with a persistent live Ubuntu 16.04.2 LTS

[d52fr (d52fr)]

After several attempts to install Ubuntu from the same USB stick, I succeeded doing so:
- downloading kubuntu-16.04.2-desktop-amd64.iso and burning a DVD-RW
- keeping the DVD in the player
- Stopping Windows but with the choice "Reboot" and pressing the Shift key all along the closing process
- When a blue start screen "Choose an option" pops-up, choosing "Open a peripherical device" then choosing "UEFI : DVD"
- installing Kubuntu with the standard process
- rebooting and discovering the GRUB menu with a choice between Ubuntu and Windows Boot Record

Every thing is fine now.