I herd It's impossible to hack it
Not exactly true, however it is much less prone to hacking than windoze. The 10 of thousands of viruses that effect windows will not run on linux. Can you break into a linux system, yes. It is possible to set it up to make it very difficult to do so.
Now, your problem. From the .jpg you posted, it shows one partition with file system type ext4 showing 9.9 gig. That is about the correct size for a full install. The rest of the partitions are still NTFS. Understand linux can mount windoze partitions, and read and write them. However NTFS is not a native linux file system. If windoze is gone, then you should format the rest of the partitions with ext4, this is the default file system in use by buntu's .
If you have kept windoze around, you would still need some NTFS space.
If windoze is gone, then I would start the install over. Delete the partitions, create new ones.
sda1 needs to be primary, 10 gig is good for the root partition. This is where the operating system goes. Next create an extended partition. Extended partitions you sub-divide into other partitions.
A small swap partition is a good idea. 1 gig is more than enough. The rest of the disk can be a large partition for /home. Home is where all your stuff goes.
Then install your system. Install to sda1. Installing Ubuntu is straight forward. Follow the gui, post any questions you might have.