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Running the code:

\begin{document} Test: $e^{\sum{x}}$ \end{document}

Dies, yet it runs just fine with the \usepackage{amsmath} commented out. The logs show:

!pdfTeX error: pdflatex (file fmex7.pfb): cannot open Type 1 font file for reading

Which seems to indicate a missing font. I've used amsmath quite a bit in the past and never come across the problem. A bit of googleing shows some other Debian users have had this problem but I'm not quite sure what to do here. I'm running Ubuntu 10.04 with most LaTeX packages installed.

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Odd. That works just fine for me. – TH. Aug 30 '10 at 22:07
up vote 12 down vote accepted

This seems to be caused by an out-of-date $HOME/.texmf-var folder. Simply deleting that folder should solve the problem.

(I like Ubuntu, but its TeX packages are a mess.)

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Like TH, I cannot reproduce the problem, and yet I don't have the named font file either. This points to the OP having somehow a screwed up font map. Kudos for tracking down that the error is caused by an error in $HOME. – Willie Wong Aug 30 '10 at 22:23
That solved it! This may have come about at some point when I installed a font a long time back. Thanks! – Hooked Aug 31 '10 at 15:03

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