環境：ubuntu 16.04

不設置共享目錄一切正常

設置（config.vm.synced_folder "/Users/meilang/code/", "/home/ubuntu", :nfs => true）以后 vagrant ssh則出現：

meilangdeMacBook-Pro:imooc meilang$ vagrant ssh

[email protected]'s password:?

[email protected]'s password:?

[email protected]'s password:?

[email protected]: Permission denied (publickey,password).

請問這里的密碼是怎么設置的？