vdevmap: 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/vdevmap - from package: util-vserver

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

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