Comment 35 for bug 1575248

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Mathew Hodson (mhodson) wrote : Re: "AppStream cache update completed, but some metadata was ignored due to errors." on "sudo apt-get update"

There is a fix for the warning message in bug #1644498.

You can follow the instructions in that bug to test the fix. You can also follow the progress in that bug and wait for the fix to be released for Xenial.