mtxrun: 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/mtxrun - from package: context

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

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