gvb: 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/gvb - from package: gvb

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

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