The cause is that Carbon Black is not installed on CentOS. On a CentOS installation, the file will exist: /etc/yum.repos.d/CentOS-Base.repo
Within the file there is an [extras] section, which allows other extra packages to be downloaded that Carbon Black requires. The necessary wxGTK package is retrieved from this [extras] repository.
On an OS that is not CentOS, for example RedHat, the CentOS-Base.repo file will not exist. This means the wxGTK package must be retrieved elsewhere. Please refer to the Server Sizing Guide for more details on supported operating systems.
To confirm a CentOS versus RedHat installation, review the output from the command:
# lsb_release -a
To download and install the package on RedHat
Refer to this FAQ EPEL/FAQ before installing the EPEL package.
Download epel-release-6-8.noarch.rpm RPM from the URL above, where 6.8 is the recent EPEL release for RedHat 6.
Copy the RPM to your Carbon Black Enterprise Server and run the following to install:
# rpm -Uvh <rpm_file>
Make sure enabled=1 is set in the [epel] section in the new file /etc/yum.repos.d/epel.repo: