Is the "regular" Transmission program that one alluded as "I2pTransmission"? What I don't have clear enough is: A) if it is another program ( different source code ), B) just a different configuration for the regular Transmission program (by default in most GNU/Linux distros and ...

Is it necessary to use a tracker to make a functional I2P torrent?

Apology my ignorance, but maybe the torrent system has some differences in I2P.

Can I create a I2PSnark torrent and make it work without using a tracker? Would it work?

Thank you!

The problem you have is because you are using a Debian/Ubuntu I2P installation (or Devuan/LinuxMint/Trisquel). Resume: uninstall I2P, delete the PPA or the " sources ", and try the ".jar" installer. --- BEFORE YOU DELETE I2P --- Of course, you need to recover your I2P-Bote addres...