prerm is in epiphany-browser 3.18.5-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
set -e
 
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ] ; then
    for alt in x-www-browser gnome-www-browser; do
	update-alternatives --remove $alt /usr/bin/epiphany-browser
    done
fi
 
 
exit 0
 |