I think this was discussed before, but i'm not sure how to downgrade guile on Ubuntu 18.04.2 LTS
I tried building guile-1.8.0, guile-1.8.4, guile-1.8.5, but the build fails for all three.
lilypond ./configure error:
ERROR: Please install required programs: guile-config < 1.9.0 (installed: 2.2.3) (guile-devel, guile-dev or libguile-dev package) libguile (libguile-dev, guile-devel or guile-dev package). GUILE-with-rational-bugfix
