klik is currently being prepared for use with Ubuntu. Press Alt-F2 and paste
wget klik.atekon.de/client/install -O -|sh
in order to install the klik client. Should you experience any problems or simply like klik, please post to the Ubuntu Forum thread.
The klik project has been superceded by AppImageKit, which shares a lot of ideas and team.
To learn more, visit portablelinuxapps.org
The klik homepage and documentation remains available for your reference here.