Mounting network filesystem with urbackup restore ISO


I find an intersting tutorial on how to restore manually from the urbackup restore ISO after boot.
I understand CTRL+ALT+F2 to switch to command line.
Now, second step : "Mount the server filesystem via smbmount, sshfs, nfs, … "
Well, I didn’t do that since I’m born, so : how do you mount the server filesystem ???

I tried “sshfs”: unrecognized command.

Thank you for any help : just the command to moung that network filesystem in the urbackup restore environnement.