yum -y update at %postinstall

[Luis Miguel Cruz]

That is not my case, because I am able to install new packages after the 
first boot or call yum again without problems.
Maybe it is a timeout or any other network error :(

Peter Fales wrote:
> In preparation for trying to do this as part of a postinstall, I manually
> ran this command:
> 
> 	yum -y install `cat file_full_of_package_names`
> 
> After installing a number of packages, it aborted with 
> 
> rpmdb: PANIC: fatal region error detected; run recovery
> error: db4 error(-30978) from dbenv->close: DB_RUNRECOVERY: Fatal
> error, run database recovery
> 
> and it refused to install any more packages.  I had to run "rpm --rebuilddb"
> to recover.  Perhaps something similar is happening in your case.
>