cpgr: 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/cpgr - from package: passwd

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

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