So, I got a problem while installing Ubuntu 16.04. I shrunk my HDD with 100 GB, as you can see here: click. But when I try to create a root directory and swap/home directory, as a lot of tutorials recommend, it won't work. I can dedicate 90 GB to the root, but the other 10 GB is now marked as unusable space. I looked around on the internet and didn't see a clear answer.
Quick question: if I install Ubuntu in this free space, how will I boot when I restart the computer? Boot menu or do I have to place the DVD in my computer if I want to use Ubuntu?