I'm using Ubuntu and I want to download and install LaTeX, what should I choose and where can I find it?
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The easiest way in ubuntu is to use the ubuntu package manager (from the desktop) and install the texlive package. As an editor you can choose whatever you want (texmaker, texstudio or any editor like gedit, vim and so on). Alternatively, you can use the terminal to install the packages, using
sudo apt-get install texlive texstudio
Dependencies usually are matched automatically
edit: look for the ubuntu software-center to open the package manager GUI and search for the texlive and other packages.
If you want the latest texlive version, follow these instructions: texlive quick install