Why the .deb package asks for a java8-runtime-headless dependency instead of openjdk-8-jre-headless where you do not need to use ppa to use?
Avoid using ppa packages please change this
use openjdk-8-jre-headless as dependency instead of java8-runtime-headless that only exists in a ppa
Packages providing java8-runtime-headless
Standard Java or Java compatible Runtime (headless)
OpenJDK Java runtime, using Hotspot JIT (headless)
why not use the package that is in the official debian repository and its derivatives? choosing a ppa is a serious mistake that should never happen!