I have Ubuntu Studio with its version 5 of Ardour[Ardour 5.12.0 "Working Backwards" (rev 1:5.12.0-3)], but none of the plugins shows it. I read in a forum to find a checkbox in GUI configuration, but there isn't any GUI in the configuration. Is there any limitation in Ardour 5 that comes installed on Ubuntu Studio?
I don't remember what forum I found the checkbox mentioned, but it is also mentioned in this Ardour's manual link: http://manual.ardour.org/working-with-plugins/working-with-ardour-built-plugin-editors/ (Right in the first phrases in "generic plugin editor" instructions)
@Mook765: Wow! Thank you! I was trying lots of plugins and was sure no plugin would show their GUI. Now I tryed a Calf analyser and "Voilà" It showed! I still see as weird the fact that "a-inline spectrogram" and "a-inline Scope" that are visualization plugins don't show a GUI instead of the generic, but I got happy to see Calf Analyser is showing beautifuly!
I may be saying bulshit, but I start to think the plugins that Ardour separates by category are the ones that don't show the GUI, cause now I see that all Calf plugins are separated as "unknown". Sorry about my "laymaness" and I hope new users can be helped by this post. Really thank you guys for the answers!!