Bitcoin ABC Ubuntu repo has been updated to provide the latest stable version 0.17.2

See the release notes for more details.

Repo home page:

https://launchpad.net/~bitcoin-abc/ archive/ubuntu/ppa

If you are installing for the first time just execute these commands(*):

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin-abc/ppa
sudo apt-get update
sudo apt-get install bitcoind bitcoin-qt

(*) if you already have a prev version of Bitcoin ABC just run:

sudo apt-get update
sudo apt-get upgrade

If you are experiencing an error related to libstdc 6 version being not satisfied, look at this /u/abcbtc's comment that contains the fix:

https://np.reddit.com/r/btc/comments/7a3jtg/bitcoin_abc_ubuntu_repo_has_been_updated_to_serve/dp6w39p/ i.e.

sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
sudo apt-get update
sudo apt-get install libstdc  -7-dev -y

If you are using Ubuntu 14.04 (Trusty) you also need to execute these commands before installing the Bitcoin ABC binaries:

sudo add-apt-repository ppa:sickpig/boost
sudo apt-get update

This is needed due the fact ABC bumped min version for libboost to 1.58.00 .