ntdbrestore: 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/ntdbrestore - from package: samba4-client

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

On Debian possible default full paths are:

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

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

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