Trovato:1 http://it.archive.ubuntu.com/ubuntu bionic InRelease
Trovato:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Trovato:4 http://it.archive.ubuntu.com/ubuntu bionic-updates InRelease
Trovato:5 http://it.archive.ubuntu.com/ubuntu bionic-backports InRelease
Trovato:3 https://packages.microsoft.com/repos/code stable InRelease

** (appstreamcli:10010): WARNING **: 10:20:30.199: No origin found for file it.archive.ubuntu.com_ubuntu_dists_bionic-updates_universe_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.199: No origin found for file it.archive.ubuntu.com_ubuntu_dists_bionic-updates_multiverse_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.902: No origin found for file it.archive.ubuntu.com_ubuntu_dists_bionic-backports_main_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.930: No origin found for file it.archive.ubuntu.com_ubuntu_dists_bionic-backports_universe_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.931: No origin found for file security.ubuntu.com_ubuntu_dists_bionic-security_main_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.931: No origin found for file security.ubuntu.com_ubuntu_dists_bionic-security_universe_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.932: No origin found for file security.ubuntu.com_ubuntu_dists_bionic-security_multiverse_dep11_Components-amd64.yml.gz

** (appstreamcli:10010): WARNING **: 10:20:30.932: No origin found for file it.archive.ubuntu.com_ubuntu_dists_bionic-updates_main_dep11_Components-amd64.yml.gz
Lettura elenco dei pacchetti... Fatto

Se facessi

sudo rm -rf /var/cache/app-info/xapian/default

sudo appstreamcli refresh --force

sudo apt-get update

Risolto il problema!