'''warning:''' <tt>shell_escape = t</tt> is a security issue when you're on a system with
many users; if you're running it on your own personal computer, it is safe to set this to true. (Thomas A. Schmitz)
== upgrade Latin Modern fonts ==
download and install the [http://www.ctan.org/tex-archive/fonts/lm/ lm] fonts. delete the old files preferably, many filenames were changed since the teTeX 3.0 times. when finished run:
<code>
$ sudo texhash
</code>
== upgrade ConTeXt ==