/(root of filesystem)home/(where the Users are)users name/(your personal
home dir)Desktop(yes the D needs capitalized when working in the
terminal because all files are case sensitive in Linux).

The root users home dir only shows if signed in as root. unless you move
to the filesystem found in the left hand column. Nautilus will open in
your home dir.

I click on filesystem in the side column when I need to get to the root
directory, different than the root home directory that is hidden unless
you sign in as root. For the most part everything you do should be in
your home directory. Only exception is if you absolutely need root
privileges.

What you need to know is even if you can access everything on your hard
drive. Privilege keeps you from messing with the system before you know
enough to play safe. "This is a good thing" for Linux users, bad for
computer professionals that make a living off people who mess deeper
than they should on there unprotected Windows file systems.

People that have the desire and want to know how to dig deeper learn
how. You can too. It will take a little frustration on your part but we
can help you with these things just ask. For now understand people that
think Nautilus or Unity the default desktop on Ubuntu 12.04, simply have
not taken the time to learn how to use the systems.

Most new users I have worked with, like the Unity desktop over KDE or
gnome. Why? You have to know more about Linux than what new users know
to use KDE. Gnome as we knew it, is no longer an option. I like the
desktop Unity. I do more than play games and browse. I use Nautilus to
search my files, and I have at least 1T worth of them. I find and move
files from my other distro installs and external drive.

When someone says you can't, don't believe it when using Linux. When
someone says you can't in Windows there is likely some truth to the
statement.

One more time. I use Unity. I use Nautilus. There is nothing I won't try
including Terminal work. The Protect the User from himself (big brother
garbage) just does not apply with these systems. Some things can be
easer using KDE but in the long run KDE requires more knowledge than a
new user has so the learning curve is greater. If one has no desire to
play with the OS, or to learn it. Unity is likely a good fit. Because I
desired to help new users I have spent many hours using Unity. I have
the KDE desktop installed on all my machines, and use it from time to
time. I have found myself logging in to Unity most of the time now days.
For those that can't find how to change the desktop they use after it is
installed you will find a Ubuntu Icon next to the password box if you
are using 12.04 as I do.