vg: 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/vg - from package: cgvg

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