从 18.10 更新至 19/20

从 18.10 更新至 19/20

我一直尝试从 18.10 升级到至少 19.04,例如使用此处的说明 每当我打字do-release-upgrade时,我都会得到

Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

Please install all available updates for your release before upgrading.

我不知道在这个节骨眼上我们能做什么。

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