How can the server be upgraded without these errors?

Please be sure to read this first: Please read this, before you start!

To install the latest packages, you should run apt dist-upgrade.

However, you still need to upgrade to version 22.04.

Based on your current level of experience, I wouldn’t recommend doing this upgrade on your own. Just because Hestia runs for free on the Oracle stack doesn’t mean it’s a good idea — unless you have solid system administration knowledge, it can easily go wrong.

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