freeradius: 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

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/lib/debug/usr/sbin/freeradius - from package: freeradius-dbg
/usr/sbin/freeradius - from package: freeradius

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