No documentation on how to install a new package or choose mirror.

[Barafu]

There is no documentation anywhere telling how to install a new package with the app, only about how to update existing packages. There is also no documentation on how to choose a mirror from which it will download. Is the app only capable of updating already installed packages, only on the latest vanilla Debian?

[rickysarraf]

Yes. Possibly not exampled out in the howto but it certainly is there in the manpage.

   set FILENAME [-h] [--install-packages PKG...PKG_N] [--install-src-packages PKG...PKG_N] --src-build-dep [--release release_name] [--update] [--upgrade] [--upgrade-type upgrade]
       set generates a signature file with the data required to install on or update the disconnected machine.

       FILENAME {apt-offline.sig} is the signature file generated on the machine. This file will contain all the information necessary for apt.

       --simulate
              Developer only. Used for testing.

       --install-packages [PKG...PKG_N]
                 Packages that need to be installed

       --install-src-packages [PKG...PKG_N]
                 Source packages that need to be installed

[rickysarraf]

Closing now.