Before installing, a package’s dependencies and conflicts are stored in the control file (of the .deb). Once the package is installed, where are the list its dependencies and conflicts?
I need to remove and then install (not reinstall) substitute, so I figured that the easiest way to do so without having to remove and then install every package would be to temporarily remove the dependency of substitute from every package, and then do what I need (uninstall and reinstall it).
I’m hoping that if I do this, substitute will begin working. Everything else I’ve tried (manually removing its files and force installing either version 0.1.9 or 0.1.13 with dpkg, downgrading from 0.1.13 to 0.1.9, etc.) hasn’t worked.