Some ideas:
Reinstall the flash-plugin package with Yast, then uninstall it;
if Yast doesn't want to install it, use the rpm command in a console, if necessary with the force option; then uninstall it with Yast;
another idea is to create an empty /usr/lib/flash-plugin folder under root login, and then see if it is enough for Yast to do the uninstallation;
maybe other ways...
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