From the Home page for this binder, select new -> RStudio. Then open the Extracting Data from PDFs using Tabulizer.R file.
Put your cursor at the first line in the script (top left window); run one line at a time.
default-jre in apt.txt gives me java 10, but some of what I'm reading suggests java 8. Trying this: https://tecadmin.net/install-oracle-java-8-ubuntu-via-ppa/