我在尝试升级到 ubuntu 19.04 时遇到了这个问题。
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.
显然我的版本不再受支持……这不允许我升级。看来我陷入困境了。
答案1
问题在于Please install all available updates for your release before upgrading.
一个软件包被阻止了，导致升级无法进行。我更新了被阻止的软件包，问题就解决了。