Update ppp_install_jetson.sh

ppp_install_jetson.sh

@@ -132,5 +132,10 @@ sed -i "s/#APN/$carrierapn/" provider
 sed -i "s/#DEVICE/$devicename/" provider
 mv provider /etc/ppp/peers/provider
 
+
+if ! (grep -q 'sudo route' /etc/ppp/ip-up ); then	
+    echo "sudo route add default ppp0" >> /etc/ppp/ip-up	
+fi
+
 read -p "Press ENTER key to reboot" ENTER
-reboot
+reboot