post_install() {
    echo -e "
        If you experience any problems with printing
        (like extra pages with PostScript code), try
        blacklisting the module 'usblp'.

        # echo \"blacklist usblp\" > /etc/modprobe.d/usblp.conf
    "
}

post_upgrade() {
    if [ "$(vercmp $2 1.4-2)" -lt 0 ]; then 
        post_install "$1"
    fi
}