Ethereum is an experimental cryptocurrency similar to the Bitcoin project. Questions about Ethereum should be related to using Ethereum on Ubuntu. For questions about Ethereum itself, see https://ethereum.stackexchange.com/
Ethereum (StackExchange Site) is an experimental cryptocurrency in the same vein as Bitcoin. Instead of focusing on just the exchange of currency, Ethereum operates on the concept of decentralized computing and tasks known as "smart contracts." It was proposed in late 2013, and then officially launched on July 30, 2015.
Linux provides numerous Ethereum miners, such as ethminer.
The whitepaper for Ethereum is available at the official GitHub.