le: 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/le - from package: le

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

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