mactelnetd: 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/mactelnetd - from package: mactelnet-server

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

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