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That depends more on your distribution than the windowing interface. A "blocked update" is often reported by the apt update system used (mostly) by distributions in the Debian family, and usually means that the (proposed) update would install a newer version of a library that's used by a program you've already installed, and that the installed program has not been tested with the newer version of the library. So the update is "blocked" 'til the testing is finished. (The "block" can also go the other way: a new version of a program may require a newer library, and the library may still be in the "testing" repository, so the update is "blocked" 'till the library is available.)
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