Unable to install or update Plesk on CloudLinux OS: The Yum utility failed to install the required packages

Symptoms

• Installing or updating Plesk on the CloudLinux OS fails (the same error message is also available in the log file /var/log/plesk/install/autoinstaller3.log):

  # sh <(curl https://autoinstall.plesk.com/one-click-installer || wget -O - https://autoinstall.plesk.com/one-click-installer)
  ...
  Exception: Failed to solve dependencies:
  psa-updates-17.8.11-rhel6.build1708200211.19.noarch requires nss >= 3.44.0-7.el6_10
  plesk-php70-pspell-7.0.33-centos7.18120712.x86_64 requires libpspell.so.15()(64bit)
  sw-engine-cli-2.24-2.24.11-0centos.7.181127.1152.x86_64 requires libicuuc.so.50()(64bit)
  plesk-php70-imagick-3.4.3-centos7.18021515.x86_64 requires libMagickWand.so.5()(64bit)
  1:plesk-php73-intl-7.3.0-centos7.18121116.x86_64 requires libicui18n.so.50()(64bit)
  plesk-core-17.8.11-cos7.build1708180301.19.x86_64 requires perl-Text-Iconv
  ...
  Error: The Yum utility failed to install the required packages.
  Attention! Your software might be inoperable.
  Please contact product technical support.

• The CloudLinux repository is shown as disabled:

  # yum repolist | egrep ^cloudlinux | egrep server
  (Empty Output)

• The CloudLinux repository is disabled in the file /etc/yum.repos.d/cloudlinux.repo:

  # egrep ^\\[cloudlinux\|enabled /etc/yum.repos.d/cloudlinux.repo
  [cloudlinux-base]
  enabled=0
  [cloudlinux-updates]
  enabled=0
  ...

• CloudLinux plugin for YUM yum-rhn-plugin is installed but it is disabled:

  # cat /etc/yum/pluginconf.d/rhnplugin.conf
  [main]
  enabled = 0
  ...

Cause

By default, CloudLinux repository is disabled because it is managed by CloudLinux YUM plugin yum-rhn-plugin. As this plugin is disabled, the CloudLinux repository remains disabled.

Resolution

1. Connect into the server using SSH.

2. Back up the file /etc/yum/pluginconf.d/rhnplugin.conf:

   # cp -a /etc/yum/pluginconf.d/rhnplugin.conf{,.backup}

3. Enable the CloudLinux YUM plugin:

   # sed -i 's/^enabled = 0/enabled = 1/' /etc/yum/pluginconf.d/rhnplugin.conf

4. Verify that the CloudLinux repository became enabled:

   # yum repolist
   ...
   cloudlinux-imunify360/7/x86_64 CloudLinux-7 - Imunify360 756
   cloudlinux-x86_64-server-7 CloudLinux Server 7 x86_64 47,408
   repolist: 48,164

5. Install Plesk or update it.