samusrgrp: 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/samusrgrp - from package: chntpw

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

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