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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

When run sudo apt-get update i'm just facing this issue. Ubuntu Version: 18.04.1

Ahmed Ashour
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Avijit Das
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1 Answers1

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There seems to be an "illegal character" in that xml (a & inside a string), the manual solution is to find the line (usually 265) and encode propperly the & as &, the technical explanation is that a & inside a xml starts an entity as explanied here, so replacing & with & makes the XML valid again.

for reference see comment by Sun Bear at this askubuntu thread

and his proposed solution here https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1644498/comments/56

alo Malbarez
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