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

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