vhd-util: 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/vhd-util - from package: blktap-utils

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

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