NFS无法挂载，出现错误：reason given by server: Permission denied的解决办法

The ANSWER:

The problem was that the special nfsd file system that mounts to /proc/fs/nfsd wasn't mounted. I'm not sure how it gets mounted (maybe rc.sysinit does it?), but I tool the advice from the forum entry and added an entry to /etc/fstab

none /proc/fs/nfsd nfsd auto,defaults 0 0

then ran mount -a

After this the mount worked fine. I hope that someone finds this helpful.

另附：

#mount -a时，出现错误提示：

Error: cannot mount filesystem: Protocol error

解决的方法很简单，到VMware中将虚拟机选项中的”Shared Folders”设置为Enabled即可。

重新启动这个错误就没有了，共享文件夹可以在Ubuntu的/mnt/hgfs下看到。