mtcvtodd: 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/mtcvtodd - from package: simh

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

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