安装支持USB的扩展包错误

错误消息：

Failed to install "/home/bjn/Downloads/Linux/soft/Oracle_VM_VirtualBox_Extension_Pack-4.1.4-74291.vbox-extpack": The installer failed with exit code 127: Error creating textual authentication agent: Error opening current controlling terminal for the process (`/dev/tty'): No such device or address

解决（好像因为权限问题）：

sudo VBoxManage extpack install --replace Downloads/Linux/soft/Oracle_VM_VirtualBox_Extension_Pack-4.1.4-74291.vbox-extpack