gradm2: command not found

Have You tried accessing the binary with the full path?

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:

/sbin/gradm2 - from package: gradm2

You may install the required package with command apt-get install {package}
Error in other languages:
gradm2: bevel nie gevind nie
gradm2: comandă negăsită
gradm2: comando não encontrado
gradm2: commande introuvable
gradm2: command not found
gradm2: käsku ei ole
gradm2: không tìm thấy lệnh
gradm2: komanda nerasta
gradm2: Kommando nicht gefunden.
gradm2: kommandot finns inte
gradm2: komut yok
gradm2: nie znaleziono polecenia
gradm2: níor aimsíodh an t-ordú
gradm2: no se encontró la orden
gradm2: no s'ha trobat l'ordre
gradm2: opdracht niet gevonden
gradm2: parancs nem található
gradm2: perintah tidak ditemukan
gradm2: príkaz nenájdený
gradm2: příkaz nenalezen
gradm2: команда не найдена
gradm2: командата не е открита
gradm2: 命令找不到
gradm2: コマンドが見つかりません