raddebug: 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/sbin/raddebug - from package: freeradius

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

On Debian possible default full paths are:

/usr/sbin/raddebug - from package: freeradius

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

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