mtlogin: 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/lib/rancid/bin/mtlogin - from package: rancid

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

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