m2e: 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/m2e - from package: alliance

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

Error in other languages:
m2e: bevel nie gevind nie
m2e: comandă negăsită
m2e: comando não encontrado
m2e: commande introuvable
m2e: command not found
m2e: käsku ei ole
m2e: không tìm thấy lệnh
m2e: komanda nerasta
m2e: Kommando nicht gefunden.
m2e: kommandot finns inte
m2e: komut yok
m2e: nie znaleziono polecenia
m2e: níor aimsíodh an t-ordú
m2e: no se encontró la orden
m2e: no s'ha trobat l'ordre
m2e: opdracht niet gevonden
m2e: parancs nem található
m2e: perintah tidak ditemukan
m2e: príkaz nenájdený
m2e: příkaz nenalezen
m2e: команда не найдена
m2e: командата не е открита
m2e: 命令找不到
m2e: コマンドが見つかりません