an other broken quest. I want to do the quest "warwick homestead: greenskins". but wen I want to talk roger warwick the only conversation i getting is "I wanna trade a few things" thanks to that I can not do anymore quest for the minutemen.

this only happens to me???

You're not alone. A number of people have been having this issue, including myself. It's not too troublesome for me as I have already unlocked the settlement through other means along with every other settlement for the Minutemen. However, its another buggy quests that has gone uncompleted in my quest log forever.