My question is in the title. Problem:
Comparison with other distros doesn't speak about installing a local .deb in Debian or whatever is Gentoo's equivalent or Alpine Linux's .apk. Plus the command
apk add complains about unsatisfiable dependencies for the world when I want it to install from .apk file downloaded, and it doesn't tell what's wrong, just:
world: <package_name> <package_name>
Simple more-or-less obvious searches such as
how to install apk on alpine linux returns something weird or Android stuff, making Alpine Linux look like it doesn't exist in the first place -or- doesn't support installing a downloaded package like you can do in Debian with dpkg.