My system had the following packages upgraded:

Upgrade: linux-headers-generic:amd64 (4.4.0.130.136, 4.4.0.131.137),
linux-libc-dev:amd64 (4.4.0-130.156, 4.4.0-131.157), linux-image-
generic:amd64 (4.4.0.130.136, 4.4.0.131.137), linux-generic:amd64
(4.4.0.130.136, 4.4.0.131.137)

After that, there were errors again whenever I did `sudo apt update`. I
opened  `/var/cache/app-info/xmls/fwupd.xml` as `sudo`, went to line 256
and changed symbol `&` to `&`, saved the changes, and ran command
`sudo appstreamcli refresh --force`. Thereafter, no errors appeared
during `sudo apt update`. W/o running  command `sudo appstreamcli
refresh --force` the error persisted.

Hope this finding will be helpful to others in the same situation.

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https://bugs.launchpad.net/bugs/1644498

Title:
  apt-get update returns "AppStream cache update completed, but some
  metadata was ignored due to errors." periodically

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