报错提示
执行sudo apt-get update时，报错如下
…
Ign:188 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse Translation-en
Ign:189 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse amd64 DEP-11 Metadata
Ign:190 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security/multiverse DEP-11 64x64 Icons
Err:121 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main amd64 Packages
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Ign:122 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main i386 Packages
Ign:123 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial/main Translation-en
…
Reading package lists… Done
W: The repository ‘https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository ‘https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository ‘https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository ‘https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security Release’ does not have a Release file.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-backports/restricted/binary-amd64/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial/main/binary-amd64/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-updates/main/binary-amd64/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-security/main/binary-amd64/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: Some index files failed to download. They have been ignored, or old ones used instead.
解决方法
step 1
将 /etc/apt/sources.list 中的https 都替换成 http，我使用的是清华源，ubuntu16.04，修改后如下
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
step 2
sudo apt-get update
sudo apt-get upgrade
step 3
把step 1的修改复原即可，复原后如下
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
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