我正在尝试升级运行 18.04 的旧 AWS EC2 VM。我收到此错误：
$ sudo do-release-upgrade
Checking for a new Ubuntu release
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
盒子上的其他所有东西都可以连接到互联网，我甚至可以https://changelogs.ubuntu.com/meta-release-lts成功。为什么 do-release-upgrade 无法连接到 changelogs.ubuntu.com ？