muinshee: 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/muinshee - from package: banshee

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

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