I was dual booted with Windows 10 and Ubuntu 15.04 (I installed Windows then Ubuntu), and when I used the software updater right after the Ubuntu install, it would freeze (window would dim) while updating grub 2. I was able to force quit and run software updater again, in which it would tell me to restart the computer and grub would work, but it just irks me that it wasn't installed smoothly.
I just reformatted my drive and installed only Ubuntu and there were no issues with updating. Anyone have any thoughts why?