Yup that did the trick. Indeed I did have the buntu package installed, and
it was still giving me the error. Compiling & installing fixed that.
Couldn't run the plugin, zynjacku & lv2host both gave a traceback, see here
if intrested in details:
http://fpaste.org/IXH9/
Ardour2 crashed too, as did my own project.
What version of zynjacku / lv2host can you confirm it works in? I can grab
that revision and test if needed.
Cheers, -Harry