To mount an NFS share on Ubuntu:
sudo mount -t nfs4 ip-address=of-nas:/volume[x]/sharename /mnt/path
If you get this error:
mount: /mnt/path: bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount.<type> helper program
Install helpers (from here):
# for NFS
sudo apt install nfs-common
# for SMB
sudo apt install cifs-utils
For mounting an SMB share using a specific userid (will be prompted for password):
sudo mount -t cifs -o username=your-user-id //ip-address/sharename /mnt/path
Note for ugreen NAS shares, the sharename is just the sharename and not /volume[]x]/sharename