We found that in some case when installing Pyramid on Linux Centos, the installer hangs on the IMDB phase.

In the current installer 2018.05.642 (5.4)
there's a missing switch "-y" that enable the installation to proceed without the user intervention.

in order to fix the problem please follow the instruction below:

1. Stop the installation.
    
2. Delete the following files:
   Under /etc folder, delete the following file: pareg.ini
   Under /etc you will have the following folder: init.d, inside the folder you will need to delete the following files:
   • pyramidAgent,
   • pyramidFs,
   • pyramidPG,
   • pyramidRTE,
   • pyramidTE,
   • pyramidWeb.
3. Now install the missing feature: sudo yum install yum-utils
    
4. Run the installation again.

For a clean install, simply start from step 3, then 4.
This should be fixed for version 6 onwards.