Comment 3 for bug 1764450

An effective workaround is to build Marc Vinyal's fork as described by David Foerster here
https://askubuntu.com/questions/1028522/how-can-i-install-pdftk-in-ubuntu-18-04-bionic-shell-version-no-gtk and then wrap the jar file into an executable called "pdftk" using the lovely trick described here https://coderwall.com/p/ssuaxa/how-to-make-a-jar-file-linux-executable. This works perfectly for me and could point the way to a maintainable way forward for pdftk under Ubuntu. Maybe somebody who understands packaging could create a deb with the right dependencies, and put it on a repository somewhere?