I am a student of De La Salle University Philippines, and we do have a project regarding Operating System, and i choose Linux Ubuntu as one of my Operating System to discuss, i need the following information;
2. Memory Management
3. File System
if someone could help me find this information or give me references or citations, and website which tell the pertinent information will be a big help
email me at email@example.com
Well, if you want the blood and guts, I'm staring at Understanding the Linux Kernel on my bookshelf as I type this reply.
It should answer all four of your questions, and there are more general OS type books you could read as well to supplement your curriculum, like reading a piece from Linus Torvalds' MINIX mentor, Andrew Tanenbaum.