2.2.3 Requirement for installing Oracle Linux 6.10 with UEFI support

The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

2.2.3 Requirement for installing Oracle Linux 6.10 with UEFI support

If your system supports UEFI boot mode, and you want to boot in this mode to install Oracle Linux 6.10, the target disk must use the GUID Partition Table (GPT), as some UEFI firmwares do not allow UEFI/MBR boot. (Bug ID 28213206)