====== Install & Upgrade Problems ======
===== Upgrade to 10.11.18 on Debian 12 =====
Upgrading MariaDB on Debian version 12 to version: 10.11.18-MariaDB-0+deb12u1 Debian 12 cases errors in journalctl. This section describes solution.

==== Compression Plugin error in journalctl ====
Correct it by reinstalling the plugins:
<code>
apt install --reinstall mariadb-plugin-provider-bzip2 
apt install --reinstall mariadb-plugin-provider-lz4 
apt install --reinstall mariadb-plugin-provider-lzma 
apt install --reinstall mariadb-plugin-provider-lzo 
apt install --reinstall mariadb-plugin-provider-snappy
</code>

==== Permission problem ====
Error when starting mariadb.service
  /bin/sh: 1: cannot create /run/mysqld/wsrep-start-position: Permission denied

=== Problem description ===
The socket ///lib/systemd/system/mariadb.socket// is started by //sockets.target.wants// before the service //systemd-tmpfiles-setup.service//!
Due to this the directory /run/mysqld is already created with root:root ownership
Due to this: /lib/systemd/system/mariadb.service breaks because it cannot write in /run/mysqld

=== Solution ===
There are two possible fixes:
== Solution 1 ==
Add the following in mariadb.service:
  ExecStartPre=+/bin/sh -c "/usr/bin/chown mysql:mysql /run/mysqld"
== Solution 2 ==
Disable the socket, which was not used anyway in our setup 
  systemctl disable mariadb.socket