ubuntu 换源
sudo apt update
（图片来源网络，侵删）
错误如下
Ign:1 http://security.ubuntu.com/ubuntu focal-security InRelease Ign:2 http://us.archive.ubuntu.com/ubuntu focal InRelease Err:3 http://security.ubuntu.com/ubuntu focal-security Release SECURITY: URL redirect target contains control characters, rejecting. [IP: 91.189.91.81 80] Ign:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease Ign:5 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease Err:6 http://us.archive.ubuntu.com/ubuntu focal Release SECURITY: URL redirect target contains control characters, rejecting. [IP: 91.189.91.81 80] Err:7 http://us.archive.ubuntu.com/ubuntu focal-updates Release SECURITY: URL redirect target contains control characters, rejecting. [IP: 91.189.91.83 80] Err:8 http://us.archive.ubuntu.com/ubuntu focal-backports Release SECURITY: URL redirect target contains control characters, rejecting. [IP: 91.189.91.83 80] Reading package lists... Done E: The repository 'http://security.ubuntu.com/ubuntu focal-security Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://us.archive.ubuntu.com/ubuntu focal Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://us.archive.ubuntu.com/ubuntu focal-updates Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://us.archive.ubuntu.com/ubuntu focal-backports Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
--- > 换源后解决
换源方法如后面。
就换源就解决了，很简单
1，更换网络，改用手机连接
2，更换https软件软件源，比如清华的。
打开链接：https://mirror.tuna.tsinghua.edu.cn/help/ubuntu/
选择合适的ubuntu版本，更新仓库配置文件/etc/apt/sources.list。
mv /etc/apt/sources.list /etc/apt/sources.list_bak
vim /etc/apt/sources.list
refer https://blog.csdn.net/shangyexin/article/details/102657776
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