Installation of Plesk updates fails: ERROR: Failed to run the Yum utility. The Yum utility failed to install the required packages

Symptoms

• Installation of Plesk updates fails with the following error:

  PLESK_ERROR: ERROR: Failed to run the Yum utility.
  The Yum utility failed to install the required packages.

• The following error can be found in the /var/log/plesk/install/autoinstaller3.log file:

  Running Transaction Check
  Error in PREIN scriptlet in rpm package MariaDB-server-10.3.10-1.el7.centos.x86_64
  MariaDB-server-10.2.14-1.el7.centos.x86_64 was supposed to be removed but is not!
  1:mariadb-server-5.5.56-2.el7.x86_64 was supposed to be removed but is not!

Cause

An unsupported MariaDB version is selected for the installation.

Resolution

1. Connect to the server via SSH as root.

2. Disable the custom MariaDB repository:
   Edit /etc/yum.repos.d/MariaDB10.3.repo file:
   Change from enabled=1
   to enabled=0

3. Clear yum cache:

   # yum clean all

4. Update Plesk:

   # plesk installer –select-release-current –reinstall-patch –upgrade-installed-components