I've defragmented my C drive and shrank it to get a free space of 40 GB.
Screenshot of my Disk Manager:
And I've disabled fast book and restarted by PC to boot from USB.When the Ubuntu installation begins, there is no option for installing Ubuntu alongside windows 10. If I choose 'something else' here's what I get:
Ubuntu installation screen-shot:
Can anyone please tell me where to go from here?