Quando tento executar qualquer comando do apt-get, recebo o erro ::
E: The method driver /usr/lib/apt/methods/https could not be found.
N: Is the package apt-transport-https installed?
Meu primeiro instinto foi tentar sudo apt-get install apt-transport-https , então eu fiz isso, apenas para obter a mesma mensagem de erro depois de aparecer para iniciar o download. Por isso, verifiquei muitas das dezenas de perguntas semelhantes neste site e descobri que a maioria recomendava sudo apt-get install apt-transport-https . Então, para ter certeza de que eu não cometi um erro estúpido, tentei de novo, e ainda não funcionou.
Outros recomendaram a verificação de erros de digitação em sources.list, e não encontrei nada além de http: // em cada link existente, então isso não pode ser o problema, tanto quanto eu sei.
Estou executando o Ubuntu 14.04 em um contêiner do Docker. Eu também posso pingar, então não acho que seja um problema da Internet. Além disso, sources.list.d está vazio.
EDITAR
A execução de sudo apt-get update --print-uris dá:
'http://archive.ubuntu.com/ubuntu/dists/trusty/main/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty_main_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/restricted/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty_restricted_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/universe/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty_universe_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/main/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/restricted/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty_restricted_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty_universe_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty/InRelease' archive.ubuntu.com_ubuntu_dists_trusty_InRelease 0
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_main_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_restricted_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_universe_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_main_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/restricted/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_restricted_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-updates_universe_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease' archive.ubuntu.com_ubuntu_dists_trusty-updates_InRelease 0
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/main/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_main_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/restricted/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_restricted_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/universe/source/Sources.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_universe_source_Sources 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/main/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_main_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/restricted/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/universe/binary-amd64/Packages.gz' archive.ubuntu.com_ubuntu_dists_trusty-security_universe_binary-amd64_Packages 0 :
'http://archive.ubuntu.com/ubuntu/dists/trusty-security/InRelease' archive.ubuntu.com_ubuntu_dists_trusty-security_InRelease 0