Issue after updating a Fedora 11 system to Fedora 12

[Bruno Wolff III]

On Tue, Dec 22, 2009 at 18:30:55 +1000,
  "Michael D. Setzer II" <mikes at kuentos.guam.net> wrote:
> I have a server that I just upgraded from Fedora 11 to Fedora 12 using the 
> net CD and the DVD image on another server.
> 
> After the initial update, there were 170 FC11 files still listed in the rpm -qa.

You really can't go by that. While it turns out for F12 there was a mass
rebuild and there were only a handful of packages that still had fc11 in
the release name, in general that doesn't have to be true.

"package-cleanup --orphans" can be used to find all installed packages that
are not in any enabled repository. This is very useful for doing clean up
after upgrading using yum and to a lesser extent if you use updates-testing or
rawhide where specific versions of packages can get dropped, orphaned or
have conflicts blocking upgrades.

You just get a list of orphans when you. That doesn't tell you what to do
with them. In some cases an update might be available but blocked by a
missing dependency or conflict. The packages might be dropped and should
be removed. They might be stuff you added manually that isn't in a repository,
but that you still want to keep.