Unable to install/update a package which is excluded in yum config file: Error while downloading packages metainfo: No package(s) available to install

Symptoms

• Plesk Installer fails with one of the following error messages:

  CONFIG_TEXT: Error while downloading packages metainfo: No package(s) available to install. Trying again.
  Failed to install mod_python:
  Number of retries is exceeded.
  InstallError: No package(s) available to install
  
  ERROR: The Yum utility failed to install the required packages.

  OR

  CONFIG_TEXT: Exception: Failed to solve dependencies:
  plesk-web-hosting-18.0-2.centos.7+p18.0.24.0+t200123.1310.x86_64 requires psa-proftpd >= 1.3.6b
  mod_passenger-5.3.5.1-centos7.19061318.x86_64 requires passenger = 5.3.5.1-centos7.19061318 psa-drweb-configurator-17.5.3-cos7.build1705170317.16.x86_64 requires glibc(x86-32)
  ERROR: The Yum utility failed to install the required packages.

• There are packages that are excluded from update in the yum config file:

  # grep exclude /etc/yum.conf
  
  exclude=apache* httpd* mod_* mysql* MySQL* da_* *ftp* exim* sendmail* php* bind-chroot* grub2* grubby* *.i?86

Cause

Packages that are excluded from update are required by dependency of other packages.

Resolution

1. Connect to the Plesk server via SSH.

2. Open the file /etc/yum.conf in a text editor. In this example, we are using the vi editor:

   # vi /etc/yum.conf

3. Comment out the exclude string by putting a hash "#" symbol at the beginning of the line:

   CONFIG_TEXT: #exclude=apache* httpd* mod_* mysql* MySQL* da_* *ftp* exim* sendmail* php* bind-chroot*

   Note: Or alternatively, remove required packages from exclusions.

4. Save the changes and close the file.

5. Rerun Plesk Installer.