Ubuntu Documentation for Advanced Users?

[Amichai Rotman]

Hello Fellow Ubuntuers,

I have used Ubuntu since version 5.4 (Warty Warthog?) and I feel as if I am
only a bit more advanced than an average user....

I there any documentation I could read, for advanced users? i.e: the ins
and outs of the system?

A run down of all system configuration files;
An in depth guide to configuring Unity;
Controlling the Boot process;
Troubleshooting...

I know I could Google(tm) for these answers, but I'd like something I could
read as a book, preferably free of charge. and gets updated dynamically (I
have a few books, but they're a bit out of date).

Kind of "The Ultimate Online Ubuntu Administrator's Guide" ;-)

Thanks!

Amichai.
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