Disk Utility not letting me partition my SSD or modify the current ones

Just yesterday I finally got my hands on a Macbook Pro in which I was planning to install Ubuntu and Windows aside from Mac for studying purposes. I was barely beginning by partitioning the disk, or at least attempting to do so and found myself not being able to take advantage of most functions of Disk Utility like in the picture below: I've already tried a couple of tutorials and even tried to apply some solutions to problems that seemed similar but nothing worked... Thanks for your time!