vwait: 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/vwait - from package: util-vserver

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

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