Does Kerkis font work with xelatex?

Question

I'm a confused on whether xelatex and kerkis font can be used together. I'm using Ubuntu 13.10, Tex Live 2013/Debian, and I have the kerkis font installed. Though, if I try to compile the following snippet:

\documentclass{article}

\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}

\usepackage{kerkis}
\setmainfont[Mapping=tex-text]{Kerkis}

\usepackage{amsmath}

\begin{document}
Hi!
\end{document}

I get the following errors:

/usr/share/texlive/texmf-dist/web2c/mktexnam: Could not map source abbreviation K for Kerkis. ... snip ... kpathsea: Running mktexmf Kerkis ! I can't find file Kerkis'. <*> ...:=ljfour; mag:=1; nonstopmode; input Kerkis ... snip ... kpathsea: Running mktexmf Kerkis ! I can't find fileKerkis'. <*> ...:=ljfour; mag:=1; nonstopmode; input Kerkis

I've searched into tex.stackexchange.com and it appears as if Kerkis works only with Babel. Is there a definitive answer? If the answer is no, what other fonts do you suggest instead ? Thanks!

Answer 1

You need the TrueType or OpenType version of Kerkis. You can download them from the University of the Aegean site in the Kerkis page. Decompress the .zip files; install the fonts and use them:

\documentclass{article}
\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{Kerkis}
\begin{document}
test
\end{document}

An image of the Properties of the document above after processing:

The Copyright belongs to the The Department of Mathematics of the University of the Aegean, Karlobasi, and the site explicitly has the follwoing warning:

If you want to use this font family in commercial work (like in books) you must include in the Copyright section the fact that you are using "Kerkis (C) Department of Mathematics, University of the Aegean".

Answer 2

Although you will probably prefer to install the truetype version of the fonts as explained in Gonzalo Medina's answer, it is not true that you must do so. You can use the type 1 fonts as follows:

\documentclass{article}

\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}
\newfontfamily\unicodefont{Latin Modern Roman}

\usepackage{kerkis}
\usepackage[T1]{fontenc}

\usepackage{amsmath}

\begin{document}
This uses legacy fonts and will not support any fontspec features which rely on opentype/truetype font specifications.

{\unicodefont For this reason, you may also wish to define a font for unicode. This is explained on page 8 of the fontspec manual.}

\end{document}

See the fontspec manual for details. While this is not the best option for Kerkis, it might be the only (or only affordable) option for other fonts in type 1 format.