Up to now, we've been relying on sickpig to manually maintain the Bitcoin ABC Ubuntu PPA.
This script automates that process, generating packages for Xenial (16.04), Bionic (18.04), and Eoan (19.10, latest release)
and uploading them to the PPA.
As demonstration, I used this script to upload 0.21.2.9 and 0.21.2.10 to a personal PPA: https://launchpad.net/~jasonbcox/+archive/ubuntu/bitcoin-abc
(the .9 and .10 versions are patch versions, which are not expected to be used in production except for hotfix type situations)