mztext: 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/mztext - from package: racket

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

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