i just installed Ubuntu GNOME 16.04 and can't boot anymore. Neither the default installation, nor manual partitioning worked.
My last configuration can be seen here.
As you can see I already tried Boot-Repair, but it made no difference.
I exchanged the HDD by a SSD 2 years ago. Installing Ubuntu 14.04 worked. Now I wanted to make a fresh install with Ubuntu GNOME 16.04, but nothing worked.