nfsmount: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/klibc/bin/nfsmount - from package: klibc-utils

You may install the required package with command apt-get install {package}

Error in other languages:
nfsmount: bevel nie gevind nie
nfsmount: comandă negăsită
nfsmount: comando não encontrado
nfsmount: commande introuvable
nfsmount: command not found
nfsmount: käsku ei ole
nfsmount: không tìm thấy lệnh
nfsmount: komanda nerasta
nfsmount: Kommando nicht gefunden.
nfsmount: kommandot finns inte
nfsmount: komut yok
nfsmount: nie znaleziono polecenia
nfsmount: níor aimsíodh an t-ordú
nfsmount: no se encontró la orden
nfsmount: no s'ha trobat l'ordre
nfsmount: opdracht niet gevonden
nfsmount: parancs nem található
nfsmount: perintah tidak ditemukan
nfsmount: príkaz nenájdený
nfsmount: příkaz nenalezen
nfsmount: команда не найдена
nfsmount: командата не е открита
nfsmount: 命令找不到
nfsmount: コマンドが見つかりません