I never had issue, not sure what is going on with ubuntu and this distribution

[jacopo brivio]

cannot install grub and it crash if I chose to install it afterwards..

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.2 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CasperVersion: 1.376
Date: Fri Aug 5 21:13:56 2016
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
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)

[apt-ghetto (apt-ghetto)]

According to the syslog, you try to install Ubuntu in BIOS-Legacy mode without a "bios_grub"-partition on a GPT disk:

Aug 5 19:13:06 ubuntu grub-installer: Installing for i386-pc platform.
Aug 5 19:13:22 ubuntu grub-installer: grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
Aug 5 19:13:22 ubuntu grub-installer: grub-install: error: embedding is not possible, but this is required for cross-disk install.
Aug 5 19:13:22 ubuntu grub-installer: error: Running 'grub-install --force "/dev/sda"' failed.

[Launchpad Janitor (janitor)]

[Expired for grub-installer (Ubuntu) because there has been no activity for 60 days.]