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Accepted Answer
Hi there @meloku,
I think that the PHPmyAdmin that ships with Ubuntu 18.04 has some issues connecting to MySQL 8, what you could do instead of using the 1-Click PHPmyAdmin install is to just install PHPmyAdmin manually so that you get the latest PHPmyAmin version.
You can follow the steps here:
https://www.digitalocean.com/community/questions/how-to-install-manually-phpmyadmin-on-ubuntu
Also, note that you might have to change caching_sha2_password to mysql_native_password for your MySQL user so that PHPmyAdmin could connect to your managed cluster, you can follow the steps on how to do that here, it also includes a short video demo:
What I could suggest is rather than using PHPmyAdmin is to use an application like dbeaver or table plus. The downside is that you need to install the applications on your PC.
Let me know how it goes! Regards, Bobby