vtprtoff: 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/vtprtoff - from package: vtprint

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

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