This is a simple transport for downloading debian packages from a repository over i2p. It uses the SAM bridge and is pretty much just a modified version of diocles/apt-tranport-http-golang, a plain HTTP transport for apt, and by modified I mean like, a couple dozen lines. This way, it uses an ephemeral destination instead of the HTTP proxy which could be associated with your other traffic.
Besides that, I think most would agree that it is simpler to use an apt transport to detect when a package should be retrieved from an i2p service. Especially in cases where the user is mixing packages from Tor, I2P, and Clearnet sources, this process can become confusing and involve configuring multiple applications along with apt. Instead, apt-transport-i2p works with other apt transports like apt-transport-tor and requires no configuration on the vast majority of systems.
WARNING: I'm introducing a change which will break existing installations of this software. When you update, make sure to update your sources.list to use the new namespace. Change all occurrences of "i2p://" to "i2psam://"
This application does not have outproxy support. If you need anonymous access to Debian packages over the clearnet, consider apt-transport-tor or the forthcoming apt-transport-i2phttp, which makes use of the HTTP proxy.
This application is beta software, more-or-less. I don't plan to change it, but I will respond to any issues that you submit. The branch tunnel-multiplexer is pre-alpha, and will become the second version of apt-transport-i2p.
If you're using Java I2P, you'll need to enable your SAM Application Bridge to be able to use the SAM API. In the browser you use to visit the router console, open 127.0.0.1:7657/configclient and check the box to run the SAM Application bridge at startup, then save your client configuration.
Then click the ">" arrow to the right of the check box to manually start the SAM bridge on the running router.
Once you've enabled the just:
make build && sudo make install
to install bin/apt-transport-i2p to /usr/lib/apt/methods/i2psam
Adding this to your sources.list.d will configure apt to seek updates to
ppa.launchpad.net/i2p-maintainers from a caching proxy at the b32 address:
h2knzawve56vtiimbdsl74bmbuw7xr65xhgrdjtjnbfxxw4hsqlq.b32.i2p
deb i2psam://h2knzawve56vtiimbdsl74bmbuw7xr65xhgrdjtjnbfxxw4hsqlq.b32.i2p/ppa.launchpad.net/i2p-maintainers/i2p/ubuntu bionic main
deb-src i2psam://h2knzawve56vtiimbdsl74bmbuw7xr65xhgrdjtjnbfxxw4hsqlq.b32.i2p/ppa.launchpad.net/i2p-maintainers/i2p/ubuntu bionic main