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
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https://bugs.launchpad.net/bugs/1829813
Title:
fwupdmgr refresh shows "Mismatched XML" error in 16.04 Ubuntu
Status in appstream-glib package in Ubuntu:
New
Status in fwupd package in Ubuntu:
New
Bug description:
Execute the `fwupdmgr refresh` command shows "Mismatched XML" message
in a fully updated Ubuntu 16.04 desktop,
To reproduce on any Ubuntu 16.04 classic (Xenial):
#apt install fwupd
#fwupdmgr refresh
failed to update metadata: Failed to parse XML: Mismatched XML
The core snap `uefi-fw-tools` used in Ubuntu Core 16 also affected
with same issue.
This is worked in Ubuntu 18.04 (bionic)
#fwupdmgr refresh
Fetching metadata https://cdn.fwupd.org/downloads/firmware.xml.gz
Downloading… [***************************************]
Fetching signature https://cdn.fwupd.org/downloads/firmware.xml.gz.asc
The `fwupd` classic confined snap also works.
===
Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial
ii fwupd 0.8.3-0ubuntu4
#fwupdmgr refresh
failed to update metadata: Failed to parse XML: Mismatched XML
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