ubuntu从18.04LTS升级到20.04LTS

ubuntu从18.04LTS升级到20.04LTS

无论是执行do-release-upgrade 还是 update-manager -d ,

都失败，提示：Failed to connect to https://changelogs.ubuntu.com/meta-release. Check your Internet connection or proxy settings。

解决办法：
修改 /etc/update-manager/meta-release 文件，把里面的https改成http

[METARELEASE]
URI = https://changelogs.ubuntu.com/meta-release
URI_LTS = https://changelogs.ubuntu.com/meta-release-lts
URI_UNSTABLE_POSTFIX = -development
URI_PROPOSED_POSTFIX = -proposed

重新执行do-release-upgrade 或 update-manager -d
皆大欢喜