Comment 1 for bug 1510709

According to apt-cache show, obconf needs:
libc, libcairo, libgdk-pixbuf, libglib, libgtk, liborender, libobt, libstartup-notification, libx11, libxml.

Among them, there are requirements for:
libfontconfig, libfreetype, libpixman, libpng, libxcb-render, libxcb-shm, libxcb, libxext, libxrender, zlib1g, libjasper, libjpeg, libtiff, libffi, libpcre, libselinux, libatk, libatk-bridge, libcups, libcolord, libpango, libpangocairo, libpangoft, libwayland-client, libwayland-cursor, libxcomposite, libxcursor, libxdamage, libxext, libxfixes, libxi, libxinerama, libxrandr, libxft, libpangoxft, librsvg, libimlib, liblzma,
with most of them seeming to come from libgtk itself.

And then they have their own dependencies.

So perhaps your assumptions are not correct? Have you checked every single dependency? If not, then I would not be concerned. Everything there looks normal to me, except perhaps ubuntu-mono.