I bought a laptop for Kali Linux. It's cheap but it works well. I want to be able to use it for more than just pen-testing though. I bought this laptop because i'm aiming to be a Network Administrator but i have a LONG ways to go and LOTS to learn. So consider me a noobie (especially when it comes to exactly which repositories to use and for what). I'd rather not be recommended to try a different distro for beginners. I want to learn the hard stuff first then everything else will be easy. Any resources with images for good explanations on repositories would be GREAT.

[U]My main goal (right now) is to be able to get things like WICD from apt-get and/or apt-get install and just use it successfully in general.

One of my questions is:

What is the difference between Regular, Bleeding Edge, and Source repositories and which one should i use if i want only want the latest stable updates for things like WICD and anything else, really.

After following the guides below i cannot get the apt-get to work to install Flash. Nor can I install WICD by using apt-get install WICD. This is what i get when doing "apt-get install wicd":

Failed to fetch http://xxxxxxxxx Size Mismatch
Unable to fetch some archives, maybe run apt-get update or try with --fix-missing

I followed this article here to get me started:

20 things to do after installing Kali Linux


Add official Kali Linux Repositories

My current Sources.list looks exactly like this:

## Regular repositories
deb http://http.kali.org/kali kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free
## Source repositories
deb-src http://http.kali.org/kali kali main non-free contrib
deb-src http://security.kali.org/kali-security kali/updates main contrib non-free

What changes do i need to make in order to use apt-get and/or apt-get install with no problems?

One more thing... I have edited the source file about twice. Is there a way to do some type of command to clean up the editing that i did to that file after adding the repositories needed to get Flash, Java, WICD, etc.

Thanks in advance for helping a noob like me !!