musetup-gtk: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/musetup-gtk - from package: musetup-gtk

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