l2test: 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/bin/l2test - from package: bluez

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

Error in other languages:
l2test: bevel nie gevind nie
l2test: comandă negăsită
l2test: comando não encontrado
l2test: commande introuvable
l2test: command not found
l2test: käsku ei ole
l2test: không tìm thấy lệnh
l2test: komanda nerasta
l2test: Kommando nicht gefunden.
l2test: kommandot finns inte
l2test: komut yok
l2test: nie znaleziono polecenia
l2test: níor aimsíodh an t-ordú
l2test: no se encontró la orden
l2test: no s'ha trobat l'ordre
l2test: opdracht niet gevonden
l2test: parancs nem található
l2test: perintah tidak ditemukan
l2test: príkaz nenájdený
l2test: příkaz nenalezen
l2test: команда не найдена
l2test: командата не е открита
l2test: 命令找不到
l2test: コマンドが見つかりません