x-face-el binary package in Ubuntu Bionic amd64

 X-Face utility provides X-Face encoder/decoder for emacsen.
 .
 For GNU Emacs users: This package includes the x-face-e21 feature
 (x-face-e21.el). It provides displaying an X-Face image inline. Also,
 it supports the Face field which contains a base64 encoded PNG image.
 If you want to scale Face images, install the netpbm package.
 .
 For XEmacs users: Displaying an X-Face image inline is supported by
 the x-face-xmas feature (x-face-xmas.el). It is enabled by default.

Source package