![如何从 18.04 升级到 20.04?](https://linux22.com/image/1185952/%E5%A6%82%E4%BD%95%E4%BB%8E%2018.04%20%E5%8D%87%E7%BA%A7%E5%88%B0%2020.04%EF%BC%9F.png)
这是将 18.04.6 升级到 20.04 的最佳方法吗?
https://www.omgubuntu.co.uk/2020/04/how-to-upgrade-to-ubuntu-20-04
当我尝试升级时收到以下消息:
$ sudo do-release-upgrade -c
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.
为什么它告诉我没有可用的开发版本?我想要一个生产 LTS 版本,对开发版本不感兴趣。我可以 pingwww.google.com所以不确定它对互联网代理设置有何看法。