Unable to install a package: Error while downloading packages metainfo: No package(s) available to install

Symptoms

• An attempt to install Plesk or one of its packages, for example, Modsecurity, fails with the following error:

  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.
  Attention! Your software might be inoperable.

  OR

  CONFIG_TEXT: Exception: Failed to solve dependencies:
  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.

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

  CONFIG_TEXT: InstallError: No package(s) available to install

• Yum configuration file contains the exclude directives:

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

Cause

Yum is configured to prevent certain RPM packages from being considered by yum for installation or upgrade. This is done by enabling exclude directives in the /etc/yum.conf .

Resolution

1. Login to Plesk via SSH;
2. Comment out the exclude directive string in the /etc/yum.conf :

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

   Note: Alternatively, remove from specific package from exclude directive that is required for futher installaton:

   For example,  glibc 32-bit is required for psa-drweb-configurator package. So, remove the *.i?86 exclusion  from the configuration file  /etc/yum.conf:

   Before:

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

   After:

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