srptool: 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:

/usr/bin/srptool - from package: gnutls-bin

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