Issue

• Satellite upgrade from 5.x to 5.6 fails with dependency error

# ./install.pl --upgrade --managed-db --skip-selinux-test
* Starting the Spacewalk installer.
* Performing pre-install checks.
* Pre-install checks complete.  Beginning installation.
* RHN Registration.
** Registration: System is already registered with RHN.  Not re-registering.
* Upgrade flag passed.  Stopping necessary services.
* Purging conflicting packages.
* Checking for uninstalled prerequisites.
** Checking if yum is available ...
There are some packages from Red Hat Enterprise Linux that are not part
of the @base group that Satellite will require to be installed on this
system. The installer will try resolve the dependencies automatically.
However, you may want to install these prerequisites manually.
Do you want the installer to resolve dependencies [y/N]?
Very well, the installer will not resolve the dependencies. Please install

        perl-Compress-Raw-Zlib
        perl-IO-Compress-Base
        perl-IO-Compress-Zlib

and rerun the installer. Thank you.