+1 on Matthias' instructions on installing the patches
(https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1579712/comments/24)...
this fixed the issue for me.
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*** This bug is a duplicate of bug 1579712 ***
https://bugs.launchpad.net/bugs/1579712
Instructions for installing the patches to test (in Matthias' comment
https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1579712/comments/24
on bug #1579712) *did* solve the issue for me.
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You