Ubuntu 16 MATE + PinguyBuilder 4.3.8 don't install GRUB

I installed only Ubuntu 16.04 MATE + PinguyBuilder 4.3.8 on an HP 64-bit Intel i3 + SecureBoot Off + ONLINE
I created an iso with PinguyBuilder.
I restarted and I installed the iso offline created by PinguyBuilder.
I restarted and there was not GRUB and was not could start.

Any idea? Thanks!