bash script in ubuntu 16

###This is a script (test.sh) that tries to include a file:

#!/bin/bash

#INCLUDE TARGETS
. ~/config.conf

##
##This is what is in ~/config.conf, and notice that there is no shebang at the start of the file:
##

USER1HOME="/home/user1"
ECHO="/bin/echo"

. ~/detect_os.fnc
detect_os;

##
##This is what is in ~/detect_os.fnc
##

detect_os() {
        UBUNTU_VER_DETECTED=`lsb_release -d`

        if [ "$UBUNTU_VER_DETECTED" == "Description:    Ubuntu 16.04.1 LTS" ] ; then
                CHOWN="/bin/chown"
                ECHO="/bin/echo"
                GZIP="/bin/gzip"
                RM="/bin/rm"
                TAR="/bin/tar"
                TIME="/usr/bin/time"
                OS="Ubuntu"
                OS_VER="16"

                ${ECHO} ${USER1HOME}

        elif [ "$UBUNTU_VER_DETECTED" != "Description:    Ubuntu 16.04.1 LTS" ] ; then
            exit 1
        fi
}