vde_plug2tap: 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/bin/vde_plug2tap - from package: vde2

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

Error in other languages:
vde_plug2tap: bevel nie gevind nie
vde_plug2tap: comandă negăsită
vde_plug2tap: comando não encontrado
vde_plug2tap: commande introuvable
vde_plug2tap: command not found
vde_plug2tap: käsku ei ole
vde_plug2tap: không tìm thấy lệnh
vde_plug2tap: komanda nerasta
vde_plug2tap: Kommando nicht gefunden.
vde_plug2tap: kommandot finns inte
vde_plug2tap: komut yok
vde_plug2tap: nie znaleziono polecenia
vde_plug2tap: níor aimsíodh an t-ordú
vde_plug2tap: no se encontró la orden
vde_plug2tap: no s'ha trobat l'ordre
vde_plug2tap: opdracht niet gevonden
vde_plug2tap: parancs nem található
vde_plug2tap: perintah tidak ditemukan
vde_plug2tap: príkaz nenájdený
vde_plug2tap: příkaz nenalezen
vde_plug2tap: команда не найдена
vde_plug2tap: командата не е открита
vde_plug2tap: 命令找不到
vde_plug2tap: コマンドが見つかりません