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Upon upgrade from previous versions, e.g. 10.3 or 10.4, debian packages mariadb-client and mariadb-server pull corresponding versions of each other as a dependency, but neither of them requires upgrade of libmariadb3, so it remains as previously installed:
ii libmariadb3:amd64 1:10.4.14+maria~xenial amd64 MariaDB database client library
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ii mariadb-client 1:10.5.4+maria~xenial all MariaDB database client (metapackage depending on the latest version)
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rc mariadb-client-10.4 1:10.4.14+maria~xenial amd64 MariaDB database client binaries
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ii mariadb-client-10.5 1:10.5.4+maria~xenial amd64 MariaDB database client binaries
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ii mariadb-client-core-10.5 1:10.5.4+maria~xenial amd64 MariaDB database core client binaries
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ii mariadb-common 1:10.5.4+maria~xenial all MariaDB common configuration files
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ii mariadb-server 1:10.5.4+maria~xenial all MariaDB database server (metapackage depending on the latest version)
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rc mariadb-server-10.4 1:10.4.14+maria~xenial amd64 MariaDB database server binaries
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ii mariadb-server-10.5 1:10.5.4+maria~xenial amd64 MariaDB database server binaries
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ii mariadb-server-core-10.5 1:10.5.4+maria~xenial amd64 MariaDB database core server files
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ii mysql-common 1:10.4.14+maria~xenial all MariaDB database common files (e.g. /etc/mysql/my.cnf)
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After that users which need client authentication plugins such as ed25519 and alike can no longer connect:
$ mysql -uu -p
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Enter password:
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ERROR 1045 (28000): Plugin client_ed25519 could not be loaded: /usr/lib/x86_64-linux-gnu/libmariadb3/plugin/client_ed25519.so: cannot open shared object file: No such file or directory
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Apparently the reason is this change in packaging between 10.4 and 10.5:
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Diff for files debs-10.3/binary/libmariadb3_10.3.24+maria~xenial_amd64.deb debs-10.5/binary/libmariadb3_10.5.4+maria~xenial_amd64.deb:
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-./usr/lib/mysql/
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-./usr/lib/mysql/plugin/
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-./usr/lib/mysql/plugin/client_ed25519.so
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-./usr/lib/mysql/plugin/dialog.so
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-./usr/lib/mysql/plugin/mysql_clear_password.so
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-./usr/lib/mysql/plugin/sha256_password.so
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+./usr/lib/x86_64-linux-gnu/libmariadb3/
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/caching_sha2_password.so
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/client_ed25519.so
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/dialog.so
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/mysql_clear_password.so
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+./usr/lib/x86_64-linux-gnu/libmariadb3/plugin/sha256_password.so
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The workaround is to upgrade libmariadb3 package explicitly.
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