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apt is the tool for downloading packages. So if you don't have internet access apt won't be very useful.
The command to install packages on debian is dpkg. So if you download a Debian package (usually named *.deb) you can install it with dpkg -i $pkg as long as you have the dependencies installed. Of course you can also install the dependencies this way, so just make sure that you bring the package and all packages that it depends on to the target machine.
Isn't apt install ***.deb an alias for dpkg -i ? (Not on my computer so cannot check)
I don't remember that working but I haven't used Debian in years so it could be.
Thanks. How do I download a package with apt? So that I can get it to the other computer?
On a computer that is online, you can say apt install --download-only foo to download (and not actually install) the .deb files for foo and its dependencies to the directory /var/cache/apt/archives/. You can then copy them from the online computer to the offline computer, and install them with dpkg -i *deb (assuming the debs are in your current working directory). Note however that apt on the online computer will only download dependencies which aren't already installed. To force re-downloading of a specific package which is already installed, you can say apt install --reinstall --download-only foo.
Instead of downloading with apt install --download-only you could also find the download paths for individual .deb packages using https://packages.debian.org/foo and then download them using a browser.
You could also copy the contents of /var/lib/apt/lists/ (after running apt update) and the contents of /var/cache/apt/archives/ both to the corresponding locations on the offline computer and, if your sources.list files have the same entries, then you can offline install the things you've put in the cache folder using apt instead of dpkg.
Or, if you have lots of disk space, you can create an offline mirror of all (or some) of debian and point your sources.list file at a local file:/// source and then you can use apt like normal but completely offline.
I used to do this many years back with a USB stick before I had Internet access at home. I think it was only the sources.list file that I needed to copy around along with a config file and the actual .deb files. It was possible to use apt-get on the offline machine instead of dpkg which worked better.
In some places, such as Cuba, people make their own Debian mirrors.
General guide is in https://www.debian.org/mirror/ftpmirror and there are more instructions in the general script used.
Then you can point your /etc/apt/sources.list to it.
Another option, suggested in other comments, is downloading *.deb files manually for each package and dependency and performing an installation with dpkg -i package.deb.
In a more specific approach, you have https://wiki.debian.org/DebianRepository/Setup.
Do you remember when you install a new Debian system and you can get packages from the CD ROM or USB stick? Debian can point to a repository in physical media, including a directory.
Generally, you can sync a hard drive with it outside with one of the tools available for this in this last wiki page, attach it to your puter when you arrive at home and party.
There is a special tool for that: apt-offline, available at: https://github.com/rickysarraf/apt-offline
You can also define a local directory as apt source folder: https://askubuntu.com/questions/170348/how-to-create-a-local-apt-repository
@flag Have a look at askubuntu.com/questions/974/ho…
It's a bit old and written for Ubuntu but at least some solutions should work on a current Debian, too.
Thank you that should be sufficient.
apt is a package manager, not an internet downloader, it uses the sources.list file as places to search a package from. You can include non internet sources like a cd rom or a usb to install packages from there.