使用nfs挂载后umount,出现can't unmount, device or resource busy 错误

错误:umount: can't forcibly umount /mnt/nfs: Device or resource busy

解决:新手可能会遇到这个问题,解决办法很简单,回到开发板根目录,再umount一次;

      即不能在当前目录下umount该目录

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转载自blog.csdn.net/weixin_42111733/article/details/80831443