Vagrant 流浪的规定不起作用

我有一个问题，安装软件使用流浪规定。我刚刚尝试安装git，但出现以下错误：

==> default: stdin: is not a tty
==> default:   git-email git-gui gitk gitweb diffutils-doc
==> default: The following NEW packages will be installed:
==> default:   git git-man liberror-perl patch
==> default: 0 upgraded, 4 newly installed, 0 to remove and 179 not   upgraded.
==> default: Need to get 6,730 kB of archives.
==> default: After this operation, 15.4 MB of additional disk space will be used.
==> default: Do you want to continue [Y/n]?
==> default: Abort.
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

我的Vargantfile看起来是这样的：

Vagrant.configure(2) do |config|
 config.vm.box = "hashicorp/precise32"
 config.vm.provision "shell", path: "bootstrap.sh"
end

我的bootstrap.sh正好包含：

#!/usr/bin/env bash
sudo apt-get update
sudo apt-get install git

我在mac和windows上尝试了它，但得到了相同的错误，我使用的是vagrant 1.7.2

从引导文件安装东西时，需要添加-y标志，否则系统将等待确认

sudo apt-get -y install git

从引导文件安装东西时需要添加-y标志，否则系统将等待确认

sudo apt-get -y install git