CSIT setup scripts get local ip address like this:

HOST_IP=$(ip route get 8.8.8.8 | awk '/8.8.8.8/ {print $NF}') 

which is currently not platform agnostic as it'll fail on Ubuntu Bionic which adds UID information (newer iproute2 release) at the end of the route entry info:

 8.8.8.8 via x.x.x.x dev eno1 src x.x.x.x uid 1354813838