While starting xfce4 or mate desktop I receive these nasty error which makes both desktops fail to work correctly :
console-kit-daemon POLKIT_IS_AUTHORITY failed
Failed to activate service org.freedesktop.Accounts
Failed to activate service org.freedesktop.Policykit1
console-kit-daemon POLKIT_IS_AUTHORITY failed
Failed to activate service org.freedesktop.Accounts
Failed to activate service org.freedesktop.Policykit1