It is nearly that easy. You follow the instructions given https://geti2p.net/en/download/debian and have I2P running.
The steps are:
- install PPA (not uncommon OBS has the same installation method)
- apt-get install i2p i2p-keyring
- start i2p
sudo dpkg-reconfigure i2p
- Open http://127.0.0.1:7657/ to configure i2p (optional)
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