I narrowed it down to
sudo apt-get install libwebkitgtk-1.0-0
not working because that package isn’t available. To remedy it I added the following to my sources: deb http://cz.archive.ubuntu.com/ubuntu bionic main universe
redoing the install for libwebkitgtk-1.0-0 worked. Then after restarting Tizen Studio…all it good. I have my certificate and was able to successfully load a test app to my watch.