ikvmstub: 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/ikvmstub - from package: ikvm

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

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