Fatal error with Ubuntu Mono 0.8 in LaTeX

Using the font Ubuntu Mono 0.8 with xelatex from TeX Live 2011 results in a fatal error.

This can be reproduced by saving the following in a text file called e.g. document.tex

\documentclass{article}
\usepackage{fontspec}
\begin{document}
\fontspec{Ubuntu Mono}ABCDEFGHIJKLMNOPQRSTUVWXY
\end{document}

and to run
  xelatex document.tex

The output will be:
  ** WARNING ** Invalid glyph name index number: 1305 (>= 1305)
  ** WARNING ** Invalid version 2.0 'post' table
  ** ERROR ** Could not obtain necessary font info.

  Output file removed.
   )
  Error 256 (driver return code) generating output;
  file document.pdf may not be valid.
and no PDF is produced.

Opening the Ubuntu Mono font files in fontforge also results in some errors and warning which need fixing.

I hope this can be fixed as soon as possible so people using LaTeX can also continune to use Ubuntu Mono as before.