I thought that the discussion here (https://sourceforge.net/p/llcon/discussion/software/thread/f38b6966fa/) might have been relevant, but I'm not seeing the connection. Maybe because I'm trying to run Jamulus on the same box that I run GarageBand on?? I have a MIDI keyboard that I'm feeding through GarageBand (on a MacBook) to produce sound. This has worked great. OK, I want to run Jamulus to work remotely with my band. I bought a Scarlett 2i2 that I hoped would do the job. I feed GarageBand output...
I'm running aground building/installing Jamulus on GCP. I'm following directions, I think; on GCP I have to use a Linux client to stay free. I'm trying to get the prereqs for building Jamulus but getting "not found" errors. On Ubuntu 18.04 I'm doing the "sudo apt-get install build-essential qt5-qmake qtdeclarative5-dev qt5-default qttools5-dev-tools" and getting errors that some of my packages cannot be found. Seems that "build-essential" loads OK, but (e.g.) I get an "E: Unable to locate package...