How to migrate Legacy GRUB into GRUB2 after upgrading into Red Hat Enterprise Linux 7

Solution Verified - Updated -

Issue

  • I upgraded my Red Hat Enterprise Linux 6.8 machine into Red Hat Enterprise Linux 7.2 with preupgrade-assistant and redhat-upgrade-tool.
  • After the upgrade, Legacy GRUB is still used as the bootloader. How can I switch it into GRUB2?

Environment

Red Hat Enterprise Linux 7

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