.. code-block:: console
# Ubuntu/Debian.
- sudo apt-get -y install texlive-latex-extra
+ sudo apt-get -y install texlive-latex-extra texlive-lang-greek
# Red Hat/Fedora, selective install.
- sudo dnf -y install texlive-collection-latexextra
+ sudo dnf -y install texlive-collection-latexextra texlive-greek-fontenc
`Latexmk <http://personal.psu.edu/jcc8/software/latexmk-jcc/>`_ is a perl script
for running LaTeX for resolving cross references,