To run KBibTeX, you need to have the following components installed on your system:
LATEX: high-quality document typesetting program. Most likely you want the TeX Live (or on older systems the teTEX) package, if you are on a Unix-like system. It is an optional dependency, but without it KBibTeX provides very limited functionality.
bibtex2html collection of tools for translating from BibTEX to HTML to enhance KBibTeX entry previewing capabilities (optional dependency).
Most of these items as well as KBibTeX itself might be included in your Linux® distribution; please refer to your distribution documentation, or refer to your installation CD or DVD, for adding these packages to your computer.