ax25d: 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/ax25d - from package: ax25-tools

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

Error in other languages:
ax25d: bevel nie gevind nie
ax25d: comandă negăsită
ax25d: comando não encontrado
ax25d: commande introuvable
ax25d: command not found
ax25d: käsku ei ole
ax25d: không tìm thấy lệnh
ax25d: komanda nerasta
ax25d: Kommando nicht gefunden.
ax25d: kommandot finns inte
ax25d: komut yok
ax25d: nie znaleziono polecenia
ax25d: níor aimsíodh an t-ordú
ax25d: no se encontró la orden
ax25d: no s'ha trobat l'ordre
ax25d: opdracht niet gevonden
ax25d: parancs nem található
ax25d: perintah tidak ditemukan
ax25d: príkaz nenájdený
ax25d: příkaz nenalezen
ax25d: команда не найдена
ax25d: командата не е открита
ax25d: 命令找不到
ax25d: コマンドが見つかりません