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$ grep -rl 'proxy_server' /etc/aptreturns/etc/apt/apt.conf.d/proxy.conf. This is reported in my original question. Removing those lines fromproxy.confdoes not solve the errors and warnings reported in my question. If you prefer, we can continue in chat.$ ping -c 5 proxy_serverreturnsping: proxy_server: Temporary failure in name resolutionsudo http_proxy= https_proxy= apt update --fix-missing && http_proxy= https_proxy= apt upgradereturns the same output of my original question, but also the errors 'E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?. This last errors are gone if I usesudo` after&&sudoafter&&. If thegrepcommand returned/etc/apt/apt.conf.d/proxy.confand you are not wanting to use a proxy, then justmv /etc/apt/apt.conf.d/proxy.conf /tmp/and re-runsudo apt update --fix-missing && sudo apt upgrade. We can continue in chat if you like.