Not sure why exactly this might have happened. Do you have any repositories besides the basics enabled? Where exactly did you find gconf2-branding-2.20.60.noarch? I was not able to find it in any of the package repositories I checked. Same with the yast2 file. It seems, based on the version numbers, that you may be running bleeding-edge software which is not compatible with the standard distro RPMs.
RPM is supposed to help with these dependencies sure, but it is possible that certain packages can get you into impossible situations (same with .debs), if not enough time is taken into making sure that dependencies can be satisfied.
You might try downgrading those RPMs in yast to the standard ones from the 11.0 repository. If yast doesn’t put up a fuss, or threaten to downgrade or uninstall multiple packages, that may solve your issue right there.
The correct version of YAST2, for SUSE 11.0 systems, is 2.16.50.
So, you time-traveled a bit too far into the future, it seems!
The only ways I’d think that would be possible would be
(1) if one were to get SOURCE-code for YAST2 and compile and install that.
(2) Or, maybe go grab an RPM off the Internet that contained a
newer version of YAST2 and install that.
(3) Or, setup a repository that is incompatible with 11.0, that contained (newer) YAST2,
and then do an ‘upgrade’. *
Do any of those ring a bell?
[None of those are recommended if you want your system to function correctly.
As to how to fix it, I’d suggest re-installing openSUSE 11.0.]
As posted in the link above: I have had a similar issue happen.
The problem was that my repositories (the version of OpenSUSE that the repository was for) were mixed. The first thing is to check which repositories you are currently using. To do this, open a terminal window and enter the command zypper sl. This will print the repositories that are currently installed for YaST. If you see any repositories with the name Factory installed, or a repository for another version of OpenSUSE (you are using 11.0 but have a 10.3 repository installed), be sure to remove them. The biggest thing I can say is not to ignore any dependencies or downgrade any packages: that only caused me to lose my ability to use YaST and I had to reformat to repair that problem. If you need further help, post the output for zypper sl so we can see which repositories are currently in use.