I've fought and killed the cultists and taken the note. When I get to the dock and board the ship I cannot get a dialogue to start wtih the captain. I've deleted the add-ons, reinstalled, emptied caches, deleted xbox live profile and redownloaded. Went to earlier saves but nothing works to get the dialogue started. He just keeps saying "need something, can I help you?" I'm playing on an xbox360 and am at level 20. Completed the Horn and Voice quests with the greybeards.
Also, i've played through the game once before without a problem. I started a new game with a new character and preivous saves from original play-through were deleted. If that makes any difference. Thanks.
Not really very helpful but i think the problem is with the npc not the quest, without the quest Gjalund Salt-Sage should still have the dialog option take you to Solstheim (just a bit diffrent). The only thing i can think of is to leave the area for over ten in-games and then try again.
I left the area for ten days and returned, still no dialogue. I also used a shout and turned him to ice then hit with sword to see if that did anything. Nope. After fast travel and waiting another 10 days, still no dialogue. At least he isn't trying to kill me now. ;-)