I had to restart and lost 20h of gaming. Then it worked with fast travel from England to Norway and back. Without the quest selected. But still it need to be fixed
"The sons of Ragnar"-quest is till broken. Can't talk to Ubbe. This game is the most broken thing I ever played.
I have the same problem on my PS4. This is a joke, thought it was important to please your players and have the main quest playable. It's the core of the game, really don't understand how it can take days or weeks to fix?