There's this guide - https://docs.cloudron.io/guides/upgrade-ubuntu-20/ in case you haven't seen it already. Main gotcha is that the mysql server sometimes upgrades and sometimes doesn't. In the end, we want MySQL server 8. Sometimes, it asks you whether you want to remove mysql data. Be sure not to remove it!
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Solved Which ubuntu upgrade docs?
Support • • sfeldkamp -
Solved Unbound fails after update to 20.04
Support • • mehdi -
Solved Migration and Cloudron/Ubuntu Update
Support • • Shai