vmount: 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/vmount - from package: util-vserver

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

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