About 5-10 years ago, there were two programs that made this easy: Keryx and APTonCD. I can't find either program available for down-load. Keyrx used a USB drive for storage but I could use either one. If you can get one of these or something comparable running, test that it works on Ubuntu 18.04 both for storing the package and for installing it on a fresh computer - WITHOUT USING THE INTERNET FOR THE FRESH INSTALL.
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Hi There are several ways for accomplish your requirement. Even, I can write a script for to do it What software are trying to install? Take a look from my Linux experience on my profilr. Open to questions