munin-libvirt-plugins-detect: 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/sbin/munin-libvirt-plugins-detect - from package: munin-libvirt-plugins

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

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