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After a "normal" system update, my computer gets stuck in a flickering black screen. I made a Live Recovery CD and followed the "update failure" steps found in https://help.ubuntu.com/community/LiveCdRecovery

After apt-update I get "error while moving old database out of the way. Appstream cache update failed".

How can I restore broken files?

apt update output:

Err:1 ppa.launchpad.net/inkscape.dev/stable/ubuntu xenial InRelease Could not resolve 'ppa.launchpad.net'
Err:2 dl.google.com/linux/talkplugin/deb stable In Release Could not resolve 'dl.google.com'
Err:3 security.ubuntu.com/ubuntu xenial-security In Release Could not solve 'security.ubuntu.com'
Err:4 archive.ubuntu.com/ubuntu xenial In Release Could not resolve 'archive.ubuntu.com'
Err:5 archive.ubuntu.com/ubuntu xenial-updates In Release Could not resolve 'archive.ubuntu.com'
David Foerster
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