我安装了Ubuntu 16.04 LTS，当我在终端上插入# apt-get update时，它会返回这些错误
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/dep11/Components-amd64.yml.gz
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/dep11/Components-amd64.yml.xz Hash Sum mismatch
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-updates/universe/dep11/icons-64x64.tar.gz
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-updates/multiverse/dep11/Components-amd64.yml.xz
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/dep11/Components-amd64.yml.xz Hash Sum mismatch
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-backports/universe/dep11/Components-amd64.yml.xz
E: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/xenial-backports/multiverse/dep11/Components-amd64.yml.xz
E: Some index files failed to download. They have been ignored, or old ones used instead.
sources.list位于
之下#deb cdrom:[Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)]/ xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial universe
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://security.ubuntu.com/ubuntu xenial-security main restricted
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu xenial-security universe
deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu xenial-security multiverse
deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb http://members.change-vision.com/repos/apt/ astah main
操作系统是我计算机上的新功能，我只是安装了一些软件。 我从sources.list中获取了所有的deb和deb-src，然后在文件中插入最后一行。
我不知道这些错误会发生什么。
答案 0 :(得分：0)
我遇到了同样的问题。经过大量研究后，解决方案对我来说就是删除所有身份验证密钥（软件来源 - ＆gt;身份验证，逐个删除）。
之后用y-ppa-manager重新安装缺少的密钥。详细说明如何从here：
要安装它，首先要为此程序添加webupd8存储库：
sudo add-apt-repository ppa:webupd8team/y-ppa-manager更新您的软件列表并安装Y-PPA-Manager：
sudo apt-get update
sudo apt-get install y-ppa-manager运行y-ppa-manager（即输入y-ppa-manager然后按回车键）。
当出现主y-ppa-manager窗口时，单击＆＃34;高级。＆＃34;
从高级任务列表中，选择＆＃34;尝试导入所有丢失的GPG 密钥＆＃34;然后单击“确定”。
之后关闭y-ppa-manager并进行更新/升级，现在都应该没有错误。