Comment 55 for bug 1644498

Same problem here

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

apt-cache policy appstream libappstream3
appstream:
  Instalado: 0.10.6-1~ubuntu16.04.2
  Candidato: 0.10.6-1~ubuntu16.04.2
  Tabela de versão:
 *** 0.10.6-1~ubuntu16.04.2 100
        100 http://br.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
        100 /var/lib/dpkg/status
     0.9.4-1ubuntu3 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
     0.9.4-1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
libappstream3:
  Instalado: 0.9.4-1ubuntu3
  Candidato: 0.9.4-1ubuntu3
  Tabela de versão:
 *** 0.9.4-1ubuntu3 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.9.4-1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial