NFS Client Unable to Mount Shared Directory
Solution 1:
Based on your ufw status output, your firewall is currently configured to only allow incoming connections for SSH. For NFS, you will need to open the nfs (2049) and RPC portmapper (111) ports. If you only want to connect to the server over the LAN, then I'd recommend restricting the host range e.g.
sudo ufw allow from 10.0.0.0/16 to any port 2049
sudo ufw allow from 10.0.0.0/16 to any port 111
otherwise, you will need to allow from any ...