LyX is a WYSIWYM (What You See Is What You Mean) LaTeX word processor. It behaves more like a word processor than a LaTeX plain text editor, but it is not quite the same as using OpenOffice or AbiWord. A knowledge of LaTeX is not strictly required, but it may be beneficial. NOTE: You need to have Universe repositories enabled. Please read Repositories for further information concerning repositories and installation.
LyX can be installed via Synaptic, Adept, or apt-get. For this tutorial we will use the terminal/command line. At the command line, issue the following command:
# sudo apt-get install lyx
If LyX does not make it into your gnome menu, then it can be started with from the Run Application dialog (Alt+F2), by typing lyx and pressing return.
If you want to see your math symbols instead of red text, also install the latex-xft-fonts package.
Add on packages
There are various packages in the repositories which can add functionality to LyX.
latex2html allows lyx to produce html output.
foiltex is useful for making presentations.
After installing such packages you should reconfigure ( goto Edit -> Reconfigure) and then restart LyX.