Re: missing drives
When you say "C, D, E and F", do you mean that you have four hard disks in your computer?
Or is it one, just partitioned into four drives?
When Ubuntu says it will erase the hard disk, it means the whole hard disk, not just a partition; sorry.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.