vl: 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/vl - from package: atfs

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