Having the same issue. I'm now on the quest "The Light of Diplomacy". Jakarro was not showing up. Found this thread. Realized I had an active chapter. Finished the Chapter. Reset "The Light of Diplomacy", flew to Onderon in my ship. He's still not available and nowhere to be found.
At this point I honestly would not care and would actually prefer if the entire questline was reset so I could play it over again as its meant to be played.