I managed to install Cabbage in ubuntu 19.04 with JUCE 5.4.3 and a old VST SDK (for vst2 headers)
cabbageLite compiled ok but CabbageIDE had a problem in CabbageDocumentWindow.cpp
pluginExporter.settingsToUse(cabbageSettings->getUserSettings()); was generating a compiler error (method not present in pluginExporter.
I commented the line, everything seem fine, but may be it’s not the cause of the problem ?