nova-console: 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/bin/nova-console - from package: nova-console

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