Install Bitcoin and Bitcoin cash How can I install on the same Ubuntu server together Bitcoin Core and Bitcoin Cash?
You need to compile them from source or download their binary. Since they both use the same port, you will need to start one of them with -listen=0 command-line argument. Please see this discussion on github for more info: https://github.com/Bitcoin-ABC/bitcoin-abc/issues/25

Bitcoin Core


Compile from source at https://github.com/bitcoin/bitcoin
Download at https://bitcoin.org/en/download


Bitcoin Cash&ast;


Compile from source at https://github.com/Bitcoin-ABC/bitcoin-abc or https://github.com/BitcoinUnlimited/BitcoinUnlimited. 
Download binary at https://github.com/BitcoinUnlimited/BitcoinUnlimited


&ast; Contrary to Bitcoin Core there isnt a single authoritative implementation, so you will have to choose which one you want