neutron: 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/neutron - from package: python-neutronclient

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

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