ntdbtool: 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 CentOS possible default full paths are:

/usr/bin/ntdbtool - from package: samba4-client

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ntdbtool - from package: ntdb-tools

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

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