Plesk upgrade fails: Fatal error during packages installation: conflicts with file from package

Symptoms

• Plesk update or upgrade fails with the following error found at /var/log/plesk/install/autoinstaller3.log:

  Running Transaction Check
  Fatal error during packages installation: Test Transaction Errors: file /usr/lib64/python3.6/site-packages/yaml/init.py from install of python36-PyYAML-3.13-1.el7.x86_64 conflicts with file from package python3-PyYAML-5.3-2.vl7.1.x86_64
  file /usr/lib64/python3.6/site-packages/_yaml.cpython-36m-x86_64-linux-gnu.so from install of python36-PyYAML-3.13-1.el7.x86_64 conflicts with file from package python3-PyYAML-5.3-2.vl7.1.x86_64

Cause

There is a package conflict where a higher and not compatible version of a needed package is already installed.

Resolution

1. Connect to the server via SSH

2. Remove the conflicting package by name and version as found on the error, without removing any dependency as follows:

   # rpm -e --nodeps python3-PyYAML-5.3-2.vl7.1.x86_64

3. Rerun Plesk upgrade:

   # plesk installer