我曾多次尝试从 17.10 升级到 18.04，但无论是在缓存存储库级别还是在升级安装中，都遇到了相同的故障，这都归咎于互联网连接。我尝试通过无线和有线连接主服务器和美国的服务器。我认为特定错误与网络故障无关。
E:The repository 'http://security.ubuntu.com/ubuntu yakkety-security Release' no longer has a Release file.,
W:Updating from such a repository can't be done securely, and is therefore disabled by default.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
E:The repository 'http://us.archive.ubuntu.com/ubuntu yakkety Release' no longer has a Release file.,
W:Updating from such a repository can't be done securely, and is therefore disabled by default.,
W:See apt-secure(8) manpage for repository creation and user configuration details.,
E:The repository 'http://us.archive.ubuntu.com/ubuntu yakkety-updates Release' no longer has a Release file.
请参阅评论 更新于 2018 年 5 月 30 日