ncpd: 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/sbin/ncpd - from package: plptools

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

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