Canberrra GTK missingThis is more like a "note to self":
The Problem:I'm running Ubuntu 18.04 in an Oracle Virtual Box for radio experiments with the FL2k VGA adapter.
Gnuradio complained about a missing canberra-gtk module in startup. But I already had the canberra-gtk3 module installed.
The Solution:It admittedly is a bit of a shotgun solution. I simply did a:
sudo apt-get install libcanberra-gt*
and that was that.