If you get the following error on ubuntu....
./IEEEtran.cls:366:Font OT1/ppl/m/n/10=pplr7t at 10.0pt not loadable: Metric (TFM) file not found.
then install the font package on ubuntu using the command:
sudo apt-get install texlive-fonts-recommended
On Ubuntu install the following packages for IEEE related document preparation
sudo apt-get install texlive texlive-latex-extra texlive-math-extra texlive-pstricks texlive-science latex-beamer