O meu /etc/apt/sources.listcontém:
deb http://ubuntu.mirror.garr.it/ubuntu/ focal main
deb-src http://ubuntu.mirror.garr.it/ubuntu/ focal main
deb-src http://ubuntu.mirror.garr.it/ubuntu/ focal restricted universe multiverse
deb http://ubuntu.mirror.garr.it/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://ubuntu.mirror.garr.it/ubuntu/ focal-updates main restricted universe multiverse
deb http://ubuntu.mirror.garr.it/ubuntu/ focal-security main restricted universe multiverse
deb-src http://ubuntu.mirror.garr.it/ubuntu/ focal-security main restricted universe multiverse
deb http://ubuntu.mirror.garr.it/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://ubuntu.mirror.garr.it/ubuntu/ focal-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu focal partner
deb-src http://archive.canonical.com/ubuntu focal partner
Mas quando tento qualquer coisa relacionada às atualizações de software, por exemplo, sudo apt update --fix-missing && sudo apt upgrade, recebo a seguinte saída no terminal:
sudo apt update --fix-missing && sudo apt upgrade
Err:1 http://archive.canonical.com/ubuntu focal InRelease
Temporary failure resolving 'proxy_server'
Err:2 http://ubuntu.mirror.garr.it/ubuntu focal InRelease
Temporary failure resolving 'proxy_server'
Err:3 http://ubuntu.mirror.garr.it/ubuntu focal-updates InRelease
Temporary failure resolving 'proxy_server'
Err:4 http://ubuntu.mirror.garr.it/ubuntu focal-security InRelease
Temporary failure resolving 'proxy_server'
Err:5 http://ubuntu.mirror.garr.it/ubuntu focal-backports InRelease
Temporary failure resolving 'proxy_server'
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://ubuntu.mirror.garr.it/ubuntu/dists/focal/InRelease Temporary failure resolving 'proxy_server'
W: Failed to fetch http://ubuntu.mirror.garr.it/ubuntu/dists/focal-updates/InRelease Temporary failure resolving 'proxy_server'
W: Failed to fetch http://ubuntu.mirror.garr.it/ubuntu/dists/focal-security/InRelease Temporary failure resolving 'proxy_server'
W: Failed to fetch http://ubuntu.mirror.garr.it/ubuntu/dists/focal-backports/InRelease Temporary failure resolving 'proxy_server'
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/focal/InRelease Temporary failure resolving 'proxy_server'
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
E qualquer coisa que eu tento instalar dá problemas semelhantes:
$ sudo apt-get install indicator-cpufreq
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package indicator-cpufreq
Tentar alterar o servidor do Software updateaplicativo fica preso na atualização do cache ou, eventualmente, retorna um erro semelhante ao Failed to fetch one(a janela não me permite copiar e colar o erro de saída).
Mais informações sobre meu sistema:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal
O que deve entrar no services.liste proxy, e qual poderia ser o problema?
EDIT # 1: Acho que o meu /etc/apt/apt.confestá errado e gostaria de uma ajuda sobre o que poderia ser nesse arquivo. echo "$http_proxy"não retorna nada, nem env | grep -i proxy. Configurações --> Proxy Network está definido como Desativado, mas se eu marcar Manualrecebo proxy-server-ipno campo "Proxy HTTP" e 8080é a porta.
EDIT # 2: My /etc/apt/apt.conf.d/proxy.confcontém duas linhas:
Acquire::http::Proxy "http://proxy_server:port/";
Acquire::https::Proxy "http://proxy_server:port/";
