MariaDB and phpMyAdmin - Unable to authenticate with ed25519

Solution 1:

Without any details about how you arrived at that problem, I can't really be sure if my problem is the same as yours.

But if this is still relevant to you, and you have root access to the server hosting your phpMyAdmin, try:

apt install libmariadbclient18

It looks like the default mariadb-client doesn't come with the plugin needed to authenticate as ed25519. libmariadbclient18 provided a version which worked in my case.

Edit: I've just noticed you gave this answer to someone else already but suggested it didn't help you. I'll leave this here in case it helps someone else.