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如何启用 backports 存储库以便我可以获得更新版本的软件？

Ubuntu 16.04

我收到此apt update错误：

AppStream system cache was updated, but problems were found: 
Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml

我以前运行过：

sudo apt install appstream/xenial-backports
sudo apt update
sudo apt upgrade

上述错误仍然存​​在。

以 root 身份更新时出现错误。在终端中显示以下错误后更新日志。

AppStream system cache was updated, but problems were found: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh-cache > /dev/null; fi'
E: Sub-process returned an error code

我按照这个答案并执行了sudo apt install appstream/xenial-backports.

我的appstream包裹已经更新：-

$ appstreamcli --version
AppStream CLI tool version: 0.10.6

之后，强制刷新缓存数据。我收到以下错误：-

$ sudo appstreamcli refresh --force
AppStream system cache was updated, but problems were found: Metadata …