<a href="https://bitbucket.org/vkolev/gsharkdown/downloads" target="_blank">http://gsharkdown.bultux.org/download.html</a>
oppure
sudo add-apt-repository ppa:ferramroberto/gsharkdown</span>
<span style="font-family:monospace;">sudo apt-get update</span>
<span style="font-family:monospace;">sudo apt-get install gsharkdown