[texhax] Ubuntu pdflatex doesn't recognize \addbibresource{}

[Christopher W. Ryan]

I'm just beginning to learn biblatex, hoping it will ease the writing of 
papers with MLA style, as compared to bibtex.  Running Ubuntu 10.04.

I'm studying from this document:

http://www.ctan.org/tex-archive/macros/latex/exptl/biblatex/doc/biblatex.pdf

I've downloaded example files for biblatex from here:

http://ctan.org/tex-archive/macros/latex/exptl/biblatex/doc/examples/

Using them as downloaded, no modifications yet. But I get an error 
message when I try to compile introduction.tex with pdflatex. It fails 
to recognize the \addbibresource{} command in my preamble.

ryancwrf at ryancwrf-desktop:~/Downloads/ComputersAndInternet/LaTeX/BiblatexExamples$ 
pdflatex introduction.tex
This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian)
entering extended mode
(./introduction.tex
LaTeX2e <2009/09/24>
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, 
dumylang, noh
yphenation, loaded.
(/usr/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/share/texmf-texlive/tex/latex/base/size10.clo))
(/usr/share/texmf-texlive/tex/latex/base/fontenc.sty
(/usr/share/texmf-texlive/tex/latex/base/t1enc.def))
(/usr/share/texmf-texlive/tex/generic/babel/babel.sty
(/usr/share/texmf-texlive/tex/generic/babel/english.ldf
(/usr/share/texmf-texlive/tex/generic/babel/babel.def)))
(/usr/share/texmf-texlive/tex/latex/csquotes/csquotes.sty
(/usr/share/texmf-texlive/tex/latex/etoolbox/etoolbox.sty
(/usr/share/texmf-texlive/tex/latex/etex-pkg/etex.sty))
(/usr/share/texmf-texlive/tex/latex/graphics/keyval.sty)
(/usr/share/texmf-texlive/tex/latex/csquotes/csquotes.def)
(/usr/share/texmf-texlive/tex/latex/csquotes/csquotes.cfg))
(/usr/share/texmf/tex/latex/biblatex/biblatex.sty
(/usr/share/texmf-texlive/tex/latex/base/ifthen.sty)
(/usr/share/texmf-texlive/tex/latex/ltxmisc/url.sty)
(/usr/share/texmf/tex/latex/biblatex/biblatex.def)
(/usr/share/texmf/tex/latex/biblatex/bbx/authoryear.bbx
(/usr/share/texmf/tex/latex/biblatex/bbx/standard.bbx))
(/usr/share/texmf/tex/latex/biblatex/cbx/authoryear.cbx)
(/usr/share/texmf/tex/latex/biblatex/biblatex.cfg))
! Undefined control sequence.
<recently read> \addbibresource

l.23 \addbibresource
                     {biblatex-examples.bib}
?

Any suggestions about what is going wrong?

Thanks.

--Chris Ryan
SUNY Upstate Medical University Clinical Campus at Binghamton
Binghamton, NY