ax25rtctl: 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/ax25rtctl - from package: ax25-apps

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

Error in other languages:
ax25rtctl: bevel nie gevind nie
ax25rtctl: comandă negăsită
ax25rtctl: comando não encontrado
ax25rtctl: commande introuvable
ax25rtctl: command not found
ax25rtctl: käsku ei ole
ax25rtctl: không tìm thấy lệnh
ax25rtctl: komanda nerasta
ax25rtctl: Kommando nicht gefunden.
ax25rtctl: kommandot finns inte
ax25rtctl: komut yok
ax25rtctl: nie znaleziono polecenia
ax25rtctl: níor aimsíodh an t-ordú
ax25rtctl: no se encontró la orden
ax25rtctl: no s'ha trobat l'ordre
ax25rtctl: opdracht niet gevonden
ax25rtctl: parancs nem található
ax25rtctl: perintah tidak ditemukan
ax25rtctl: príkaz nenájdený
ax25rtctl: příkaz nenalezen
ax25rtctl: команда не найдена
ax25rtctl: командата не е открита
ax25rtctl: 命令找不到
ax25rtctl: コマンドが見つかりません