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Ubuntu LTS updating failing all over the world

[Impact]

* The cache refresh is blocked on a strdup on a non-NULL-terminated string in some very rare occasions (very rare because this bug is present for almost 3y without a single report).

* Fixing this bug resolves the issue for people who might experience it.

* See https://github.com/ximion/appstream/issues/35 for details.

[Test Case 1]

* Run `sudo appstreamcli refresh –force`* The AppStream cache should be updated, no change in behavior should be seen.

[Test Case 2]

* In case you were experiencing the almost-infinite hang when running `sudo appstreamcli refresh –force`, this issue should be fixed with the SRU.

[Regression Potential]

* Very low, since this only fixes the decompression code. There should be no sideeffects of that (given that the patch itself doesn’t break anything, which it shouldn’t, since it has been tested upstream for a while)

[Other Info]

* This fix has been applied upstream: https://github.com/ximion/appstream/commit/f33c520c37e2ba51d92402220250b8d501a2bf43

* A smaller version of the patch (one-liner) is available, at the expense of not having reduced memory usage: https://github.com/ximion/appstream/commit/378941787d3584b3eb31a6ebe40e0aacc10e180a

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/!/ Installing the bugfix from xenial-proposed, without going through APT:To install the fixed packages manually, please execute the following commands (for amd64, adjust URLs for other architectures):

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