The BCH Unlimited Ubuntu PPA repository has been updated to serve version 1.9.1.1 is available at:

https://launchpad.net/~bitcoin-unlimited/ archive/ubuntu/bucash

This release is compatible the Bitcoin Cash protocol. To update already installed packages:

sudo apt update 
sudo apt upgrade

To install

sudo add-apt-repository ppa:bitcoin-unlimited/bucash
sudo apt-get update
sudo apt install bitcoind bitcoin-qt

starting from this update the repository is serving also ElectrsCash(**) v3.0.0, for now just for the amd64 architecture. To install it just execute this command:

sudo apt install electrscash

See the official announcement and the release notes for more details:

https://www.reddit.com/r/btc/comments/mhvr3z/bch_unlimited_bitcoin_cash_client_has_now_been/

https://github.com/BitcoinUnlimited/BitcoinUnlimited/blob/release/doc/release-notes/release-notes-1.9.1.1.md

Support for Ubuntu Trusty 14.04 has been dropped (even thou gitian binaries are still working for that repo).

On Ubuntu 16.04 (xenial) you need to install a new PPA dependency

sudo add-apt-repository ppa:savoury1/gcc-defaults-7
sudo apt update 
sudo apt dist-upgrade
sudo apt install bitcoind 

(**) ElectrsCash is an efficient re-implementation of Electrum Server written in Rust.