@benborges Ah ok. Maybe you can wait for 7.3. Please update to that and try to update again and we can debug further. There are some cgroup v2 related fixes for Ubuntu 22 in 7.3 which affect docker container creation, it's possible you hit that case.
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!
The upgrade guides should mostly be identical for upgrading Ubuntu. The Cloudron guide has maybe couple of additional notes/configuration for making sure things are running after upgrade. What error are you hitting when upgrading following either of the docs? I suspect they hit the same error.
@necrevistonnezr Don't upgrade yet, I have a blog post that I will publish later today on how to update. It's a bit different than 16 to 18. That main difference is that the mysql server has to be upgraded as well.
That seemed to solve it, even if a server reboot did not solve it. I also got a mail, that this was also visible from other mail-servers (not just from my mail client), as I use DANE for certificate pinning.
I had the same issue. And the same fix. A reboot didn't work, a service restart did the trick. Thanks!