In some cases, cPanel may fail to install due to the following error:
(FATAL): The installation process was unable to synchronize cPanel & WHM. Verify that your network can connect to httpupdate.cpanel.net and rerun the installer.
This often occurs when the system is unable to retrieve any packages from yum. You can check for this by running the following command:
yum list available
Typically any related yum issues would be exposed from the output of that command.
The workaround will vary based on the output of the above command. Some common problems that would prevent yum from working would include an expired CloudLinux license or an issue with a 3rd party repository. The solution would involve ensuring that your CloudLinux license is active (if applicable) or that any non-functional repository is disabled.