post_install() {
    # Add swish user and group.
    getent group swish &>/dev/null || groupadd -r swish >/dev/null
    getent passwd swish &>/dev/null || useradd -m -d /home/swish \
-r -g swish swish >/dev/null

    chown -R swish:swish /usr/share/swish

    printf "\n\nYou can start and enable \
swish.service to run the server.\n\n"
}