m-a: 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/m-a - from package: module-assistant

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

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