update ubuntu and nova does not work

update ubuntu and nova does not work During the update of ubuntu I selected option Y, as below and broke one node, the new service starts but does not work from the cluster side, what can I do now to fix it? Configuration file '/etc/nova/nova.conf' ==> Modified (by you or by a script) since installation. ==> Package distributor has shipped an updated version. What would you like to do about it ? Your options are: Y or I : install the package maintainer's version N or O : keep your currently-installed version D : show the differences between the versions Z : start a shell to examine the situation The default action is to keep your current version. *** nova.conf (Y/I/N/O/D/Z) [default=N] ?