mtcvtfix: 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/mtcvtfix - from package: simh

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

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