remote-tty: 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/bin/remote-tty - from package: remote-tty

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

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