murmurd: 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/lib/debug/usr/sbin/murmurd - from package: mumble-dbg
/usr/sbin/murmurd - from package: mumble-server

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

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