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In some cases, launching Bootable Media Builder on systems running Red Hat Enterprise Linux 8(RHEL 8) may result in the following error:
"Please check the display environment variable" or
"Error: failed to open the display localhost:0.0
Please, check the DISPLAY environment variable or use the -display option.
This is by security design in the RHEL/CentOS operating system. Please launch mediabuilder using an account other than root.