unmunge: 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 CentOS possible default full paths are:

/usr/bin/unmunge - from package: munge

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/unmunge - from package: munge

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

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