a2lef: 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/a2lef - from package: alliance

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

Error in other languages:
a2lef: bevel nie gevind nie
a2lef: comandă negăsită
a2lef: comando não encontrado
a2lef: commande introuvable
a2lef: command not found
a2lef: käsku ei ole
a2lef: không tìm thấy lệnh
a2lef: komanda nerasta
a2lef: Kommando nicht gefunden.
a2lef: kommandot finns inte
a2lef: komut yok
a2lef: nie znaleziono polecenia
a2lef: níor aimsíodh an t-ordú
a2lef: no se encontró la orden
a2lef: no s'ha trobat l'ordre
a2lef: opdracht niet gevonden
a2lef: parancs nem található
a2lef: perintah tidak ditemukan
a2lef: príkaz nenájdený
a2lef: příkaz nenalezen
a2lef: команда не найдена
a2lef: командата не е открита
a2lef: 命令找不到
a2lef: コマンドが見つかりません