#mount -t nfs -o nlock 192.168.2.185:/qtproject /nfsdir/
mount: wrong fs type, bad option, bad superblock on 192.168.2.185:/qtproject,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try

       dmesg | tail  or so

解决办法： apt-get install nfs-common

# mount -t nfs -o nlock 192.168.2.185:/qtproject /nfsdir/
mount.nfs: an incorrect mount option was specified

去掉 -o nolock