vbconv: 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/vbconv - from package: voxbo

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