Description of problem:
install RH 9.0 after RH 7.3 and you will end up in a 9.0 system
that solely provides the minimum software packages 
despite the installation process extracted all RPMs.
in particular, "mc" Midnight Commander is missing 
and any X11 window manager does expose major problems on launch.

the installation will show this error message on the console
before hitting the "reboot into final system" button:
  rpmdb: fatal region error detected; run recovery

Version-Release number of selected component (if applicable):
RH 9.0

How reproducible:
always

Steps to Reproduce:
1. install RH 7.3
2. install RH 9.0
3. on reboot screen switch consoles to see installer errors
4. reboot system
    
Actual results:
console error message:  rpmdb: fatal region error detected; run recovery
missing packages in rebooted system

Expected results:
there should not be any error messages on the installer console.

if there are such serious error in the rpmdb, then the installer
should take care for them and issue a serious error message about them.

the installed system should be complete.

Additional info:
there is a related bug that describes errors with e2/e3 labeling
that happened with same machine in same dual boot config,
maybe that problem is dependent in some way to the spotted results.

at least the root cause of the rpmdb error message should be 
identified, adequately handled and therefore resolved.