That message is coming from appstream-glib, somewhere around here: https://github.com/hughsie/appstream- glib/blob/843caabdeca6ae15f400f38536bc666340c30465/libappstream-glib/as- store.c#L2329
I would recommend to start out with trying a newer appstream-glib to see if that helps. ** Also affects: appstream-glib (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1829813 Title: fwupdmgr refresh shows "Mismatched XML" error in 16.04 Ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/appstream-glib/+bug/1829813/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs