Bug in the mission Sons of Ragnar (Assassin's Creed: Valhalla)

I started the mission, talked to Sigurd in Repton, they said to go to the pier. Something ran away from them in search of treasure, reached Randvi and decided to change the mission to another. As a result, I passed it, I return to Randvi, I choose Ledecestershire again. In the "tasks" there is a label that you need to talk to Ubba. But the quest marker is not displayed on the world map. There is no Ubba anywhere in the game itself either. What to do then 🤷🏽‍♀️