muplot: 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/muplot - from package: stda

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

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