vb2cub: 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/lib/voxbo/bin/vb2cub - from package: voxbo

You may install the required package with command apt-get install {package}
Error in other languages:
vb2cub: bevel nie gevind nie
vb2cub: comandă negăsită
vb2cub: comando não encontrado
vb2cub: commande introuvable
vb2cub: command not found
vb2cub: käsku ei ole
vb2cub: không tìm thấy lệnh
vb2cub: komanda nerasta
vb2cub: Kommando nicht gefunden.
vb2cub: kommandot finns inte
vb2cub: komut yok
vb2cub: nie znaleziono polecenia
vb2cub: níor aimsíodh an t-ordú
vb2cub: no se encontró la orden
vb2cub: no s'ha trobat l'ordre
vb2cub: opdracht niet gevonden
vb2cub: parancs nem található
vb2cub: perintah tidak ditemukan
vb2cub: príkaz nenájdený
vb2cub: příkaz nenalezen
vb2cub: команда не найдена
vb2cub: командата не е открита
vb2cub: 命令找不到
vb2cub: コマンドが見つかりません