Please update Knossos to 0.14.0. RC3 and try again.
How? There is no Linux repository for anything further along than 0.13.3.
I and others have tried to build Knossos 0.14.0 locally, but the build dependencies in the Readme are out of date. I keep dying somewhere around undisclosed qt5 dependencies.
Knossos is an awesome piece of kit and a huge boon to the FSO scene. This cannot be overstated! But not all of us are code junkies for whom this is second nature. My last bit of code writing and compiling was back at university nearly 20 years ago.
I’m certainly willing to keep trying, but I for one need help.