libnovaconfig: 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 CentOS possible default full paths are:

/usr/bin/libnovaconfig - from package: libnova

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/libnovaconfig - from package: libnova-dev

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

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