vtag: 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/sbin/vtag - from package: util-vserver

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

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