vsched: 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

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/vsched - from package: util-vserver

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