Mounting NFS share over network

[bb11g13]

Hi all.

I have a raspberry pi set up as an NFS server, having followed the steps here. Both nfs-kernel-server and rpcbind is active and the pi is at 10.1.1.80 and the red pitaya is at 10.1.1.100. I have created the share at /var/nfs, set chown to nobody and nogroup, and put

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/var/nfs    10.1.1.100(rw,sync,no_subtree_check)

in /etc/exports on the pi before creating the NFS table.

The red pitaya is on the correct network and can ssh into the pi just fine, and I have created /mnt/nfs on the red pitaya as a mount point. When I execute:

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mount -o nolock 10.1.1.80:/var/nfs /mnt/nfs -v

the return includes

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...
mount.nfs: mount(2): Protocol not supported
...
mount.nfs: portmap query failed: RPC: Program not registered
...
mount.nfs: requested NFS version or transport protocol is not supported

I don't know how to fix this. I have tried checking if nfs-common is installed on the redpitaya with `apt-get nfs-common` and I initially get `nfs-common is already the newest version` followed by

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...
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
...
Setting up nfs-common (1:1.2.8-9) ...
Job for nfs-common.service failed. See 'systemctl status nfs-common.service' and 'journalctl -xn' for details.
invoke-rx.c: initscript nfs-common, action "start" failed.
dpkg: error processing package nfs-common (--configure):
  subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
  nfs-common
E: Sub-process /usr/bin/dpkg returned an error code (1)

I went in and checked `systemctl status nfs-common.service -l` and received a lot of failure messages indicating that it failed immediately upon starting. I don't know if this is the root of the problem or just something that isn't helping, but the first error appears to be in

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redpitaya rpc.idmapd[1817]: main: fcntl(/run/rpc_pipefs/nfs): Invalid argument
redpitaya nfs-common[1803]: Starting NFS common utilities: statd idmapd failed!
...

Any clues as to how to get this working?