I already visit every library, but the quest didnt completed,but it has green text on kagabangui,is there any step that i missed?

Have you checked the librarys in Aldlyn, Manastyr and Calterburry as well? You need all 4 to finish the quest.

yeah,i already check every library,but nothing happened

oh nvm,it turn out thats my fault,i thought i already check every library,but probably my progress before doesnt saved,so its kinda my fault