m6pack: 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/sbin/m6pack - from package: ax25-tools

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

Error in other languages:
m6pack: bevel nie gevind nie
m6pack: comandă negăsită
m6pack: comando não encontrado
m6pack: commande introuvable
m6pack: command not found
m6pack: käsku ei ole
m6pack: không tìm thấy lệnh
m6pack: komanda nerasta
m6pack: Kommando nicht gefunden.
m6pack: kommandot finns inte
m6pack: komut yok
m6pack: nie znaleziono polecenia
m6pack: níor aimsíodh an t-ordú
m6pack: no se encontró la orden
m6pack: no s'ha trobat l'ordre
m6pack: opdracht niet gevonden
m6pack: parancs nem található
m6pack: perintah tidak ditemukan
m6pack: príkaz nenájdený
m6pack: příkaz nenalezen
m6pack: команда не найдена
m6pack: командата не е открита
m6pack: 命令找不到
m6pack: コマンドが見つかりません