After update to 12.04 LTS 64bit I got an update that I cannot install: “Multi-arch versions of former ia32-libraries”

Since I updated my system, this update is shown, but cannot be selected. I guess, because it does not fit to my 64bit system.

But: since it is there, I always got the information that update(s) are available - which is really not the case.

How can I get rid of this?

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2. Second: Search for ia32-libs-multiarch.