从 15.10 升级到 16.04 后，我收到以下错误apt-get update：
Reading package lists... Done
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/source/Sources Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/universe/source/Sources Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/multiverse/source/Sources Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/binary-amd64/Packages Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/binary-i386/Packages Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/i18n/Translation-en Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/universe/binary-amd64/Packages Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/universe/binary-i386/Packages Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/universe/i18n/Translation-en Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/multiverse/binary-amd64/Packages Empty files can't be valid archives
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/multiverse/binary-i386/Packages Empty files can't be valid archives
E: Some index files failed to download. They have been ignored, or old ones used instead.
有谁知道如何解决这个错误？
小智 14
转到“Ubuntu 软件中心->编辑->软件源”，
从“下载自”中选择“其他...”，然后单击“选择最佳服务器”。这需要一些时间......它会为您提供最好的服务器。然后选择该服务器并再次在下面键入命令，
sudo apt-get update
小智 5
apt-get clean
与以下人员一起为我工作：
apt-key update
并按照此答案中的步骤操作：
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