Today I decided to do a fresh install of everything on my desktop computer. It has been dual-booting windows 10 together with Ubuntu 15.10 for some time now.
I first installed Windows 10 and made sure it was working as I know from previous experiences that Windows should be installed first. Thereafter I installed Ubuntu 17.04. They both share a 120 GB SSD.
After the installation finished the system is unbelievably slow at booting (~2 minutes) and boots straight into the login screen of Ubuntu.
However, for some reason GRUB is not starting as expected and my monitors keep saying No source found right until the Ubuntu login screen appears. I am unable to both enter BIOS and GRUB. I tried ESC, F11 and Shift while booting. I also tried to fix it by installing [Boot-Repair. Output] (http://paste2.org/eamDtaNh) . I also tried uncommenting the
#GRUB_HIDDEN_TIMEOUT=0 and add a value.
Hope someone here can help me as I really want both systems back up running.