How to reinstall the latest kernel and rebuild its initramfs?

Solution Verified - Updated -

Issue

  • We applied updates to the system and a new kernel was installed, but the transaction was canceled or failed before completing the installation, and the system cannot boot to the latest kernel.
  • A kernel update postscripts failed and the initramfs was not generated.

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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