I was typesetting my CV in LaTeX with a mix of Spanish and English when I got aware that when running pdfLaTeX it was not uploading hyphenation patterns for Spanish. I was using Ubuntu Jaunty 9.04. After some investigation I found out that there was a bug filed in launchpad about this issue in https://bugs.launchpad.net/ubuntu/+source/texlive-base/+bug/240823. The solution to this is running in a shell the following command:
sudo fmtutil – -all
In MiKTeX using Windows, you have to open the settings manager, go to Languages Tab and select the languages you want pdfLaTeX to use.