<p>I haven’t used Ubuntu much recently after switching several systems to Manjaro, but had to set up a laptop with XUbuntu 17.04. That came with Emacs 24.5 as the default emacs package, and as skeeto pointed out in the comments, with a separate emacs25 package for Emacs 25.1. I tend to run the latest release Emacs everywhere out of habit, so I revisited my build instructions to build a current Emacs on Ubuntu and its derivates. The good news is that in thanks to some changes in the Emacs…