Upgrade to Plesk Obsidian fails with Postfix dependency error: Error: Package: 2:postfix-perl-scripts-2.10.1-7.el7.x86_64 (base) Requires: postfix = 2:2.10.1-7.el7

Symptoms

• Upgrade to Plesk Obsidian fails with the following dependency error if postfix-perl-scripts is installed:

  PLESK_ERROR: Exception: Failed to solve dependencies:
  2:postfix-perl-scripts-2.10.1-7.el7.x86_64 requires postfix = 2:2.10.1-7.el7
  Error: Package: 2:postfix-perl-scripts-2.10.1-7.el7.x86_64 (base)
  Requires: postfix = 2:2.10.1-7.el7
  Installed: 2:postfix-3.4.5-2.centos.7+p18.0.19.0+t190904.1310.x86_64 (@PLESK_18_0_19-dist)
  postfix = 2:3.4.5-2.centos.7+p18.0.19.0+t190904.1310
  Available: 2:postfix-2.10.1-7.el7.x86_64 (base)
  postfix = 2:2.10.1-7.el7

• In Plesk Obsidian, it’s not possible to install additional Postfix packages such as postfix-perl-scripts.

Cause

This is considered as a Plesk bug with ID #PPPM-11129 which will be fixed in future Plesk updates.

Resolution

As a temporary workaround, apply the following solution:

1. Connect to the server via SSH

2. Remove postfix-perl-scripts package:

   # yum remove postfix-perl-scripts

3. Proceed with upgrade:

   # plesk installer

   Note: Currently it is not possible to use additional Postfix libraries/packages in Plesk Obsidian.