How to install LaTeX Style Files (.sty) on Ubuntu, using TeTeX or Tex Live
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One thing that makes LaTeX so powerful is the enourmous amount of extensions available. Some extensions, usually with the .sty filename extension, do not come with an installation tutorial. I consider that they do not come with a tutorial because it is assumed it is an easy task. Another reason for having no installation instructions might be because it is platform dependent (i.e., different installation directories).
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The directory for installing LaTeX files, on Ubuntu, depends on the distribution you are using. If you are using TeTeX, it is:
/usr/share/texmf-tetex/tex/latex
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If you are using TeX Live, it is:
/usr/share/texmf-texlive/tex/latex
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To install a style file you have to create a directory for it and copy the contents there. Next you have to run the program mktexlsr as root.
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This is an example on how to install the prooftree extension, using the TeTeX distribution:
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create a directory named prooftree on /usr/share/texmf-tetex/tex/latex
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copy the file prooftree.sty and the file prooftree.tex to the directory /usr/share/texmf-tetex/tex/latex/prooftree
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run sudo mktexlsr