I just upraded an old ASUS atom desktop to be a file server and installed Lubuntu 19.04 serving 3 sub folders to my LAN with various machines running raspbian, ubuntu and mate.

I got the NFS server up and running in similar was on all machines for several years, but was surprised to see my clients mounting lubuntu server with NFS ver=3 like this:-

andrew@VESA-ubuntu:/nfs$ nfsstat -m           
/nfs/all/Elements1Tb from
 Flags: rw,relatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=,mountvers=3,mountport=57921,mountproto=udp,local_lock=none,addr=

All other servers mount NFSv4 as planned.

The autofs is setup on simple basis like this (/etc/auto.nfs):

Medion1Tb  -fstype=nfs4,rw

Is see both clients and server have recent versions of NFS (1.3.4-2)

What am I missing to get NFSv4 working on the lubuntu server?

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