Ubuntu: Recovering Encrypted Files with Ecryptfs-Util
It's easy to get turned around on this, so here's a little walkthrough. Once you get the hang of it, recovering encrypted files should be more or less easy.
Background
One of my first Linux installs was Xubuntu on a 2008 MacPro (at two 3Ghz processors with 4 cores each, 15.6 Gb RAM, and an upgraded GeForce GTX card, it's still a contender in 2020). I bought the computer, prior to upgrade, for about $350 on eBay as a pet project, hoping it could take the place of my 2012 Mac Mini--a computer Apple was no longer looking to support with OS releases. The idea was to install Xubuntu on the MacPro and let one of Apple's last decent computers shine anew. At the time, it seemed like a pain to get Xubuntu to play nice with Apple's hardware.