vmm: 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/vmm - from package: vmm

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

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