pdf output does not show bold faced math fonts

Dear all

I've recently installed a fresh kubuntu distribution (7.1). after, I
apt-got texlive and related font
packages the following minimal tex file with a math formula using
\boldsymbol{a} does not properly show at pdf output, i.e. the pdf
output does not display the math symbold bold faced.
%=================================
\documentclass[12pt,english]{article}
\usepackage{mathptmx}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage{amsmath}
\usepackage{amssymb}

\makeatletter
\usepackage{babel}
\makeatother

\begin{document}
\newcommand{\bos}[1]{\ensuremath{\boldsymbol{#1}}}
\newcommand{\ba}{\bos{a}}

This is a sample

$\boldsymbol{a},a\ba$
\end{document}
%=================================

I thought that some latex fonts were missing in my fresh texlive
installation.
However after I apt-got every font package related to latex that I am
aware of, everything was the same, i.e. bold faced math symbols using
\boldsymbol were not showed bold faced at pdf output.
Therefore, I am sure I am missing something evident.

Please could somebody point me out which packages are most probably
missing in
my distribution? Any further distribution tests to check what is
lacking?
Anybody who has experienced the same problems care to share how they
were
solved?

Thank you very much for all your help and I am sorry if I have skipped
something evident

Best regards
.

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