Install i2p on Ubuntu

Add i2p debian repository

  $ sudo apt-add-repository ppa:i2p-maintainers/i2p

Update Apt-get

 $ sudo apt-get update

Install i2p package

 $ sudo apt-get install i2p

Configure Firefox/Other Browser route traffic through the i2p router

Firefox Menu -> Edit -> Advanced -> Network -> Settings
Select 'Manual proxy configuration under 'Configure Proxies to Access the Internet'
Set the 'HTTP Proxy' to 127.0.0.1 Port 4444
Set the 'SSL Proxy' to 127.0.0.1 Port 4445
No Proxy for: localhost, 127.0.0.1