vde_pcapplug: command not found

Have You tried accessing the binary with the full path?

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_pcapplug - from package: vde2

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