yum : remove + install problems

[Bruno Costacurta]

Hi All,

I tried to 'ymu remove firefox' but received hereafter errors. 
Now 'yum list installed firefox' indicates wrongly that firefox is already 
installed.
(please see hereafter output).

How to force refresh / rebuild yum database ? Other actions ?
I tried 'yum clean all' but without results.

Thanks,
Bruno

(...)
yum remove firefox
Setting up Remove Process
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package firefox.i386 0:1.0.4-4 set to be erased
---> Package firefox.i386 0:1.0.6-1.2.fc4 set to be erased
---> Package firefox.i386 0:1.0.7-1.1.fc4 set to be erased
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Removing:
 firefox                 i386       1.0.4-4          installed          50 M
 firefox                 i386       1.0.6-1.2.fc4    installed          50 M
 firefox                 i386       1.0.7-1.1.fc4    installed          50 M

Transaction Summary
=============================================================================
Install      0 Package(s)
Update       0 Package(s)
Remove       3 Package(s)
Total download size: 0
Is this ok [y/N]: y
Downloading Packages:
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Removing  : firefox                      ######################### [1/3]
/var/tmp/rpm-tmp.7910: line 
5: /usr/lib/firefox-1.0.6/firefox-rebuild-databases.pl: No such file or di            
rectory
error: %postun(firefox-1.0.6-1.2.fc4.i386) scriptlet failed, exit status 127
  Removing  : firefox                      ######################### [2/3]
/var/tmp/rpm-tmp.7910: line 
5: /usr/lib/firefox-1.0.4/firefox-rebuild-databases.pl: No such file or di            
rectory
error: %postun(firefox-1.0.4-4.i386) scriptlet failed, exit status 127
  Removing  : firefox                      ######################### [3/3]
/var/tmp/rpm-tmp.7910: line 
5: /usr/lib/firefox-1.0.7/firefox-rebuild-databases.pl: No such file or di            
rectory
error: %postun(firefox-1.0.7-1.1.fc4.i386) scriptlet failed, exit status 127

Removed: firefox.i386 0:1.0.4-4 firefox.i386 0:1.0.6-1.2.fc4 firefox.i386 
0:1.0.7-1.1.fc4
Complete !
(...)

yum list installed firefox
Installed Packages
firefox.i386                             1.0.7-1.1.fc4          installed
firefox.i386                             1.0.6-1.2.fc4          installed
firefox.i386                             1.0.4-4                installed
(...)