ReaR/UEFI: USB boot fails when selecting Grub menu entry with "error: ../../grub-core/script/function.c:119:can't find command `XXX`" message

Solution Verified - Updated -

Issue

  • Trying to boot a USB key used to store the ReaR backup, in UEFI mode, the following error messages are seen when booting the Recovery environment

    error: ../../grub-core/script/function.c:119:can't find command `echo'.
error: ../../grub-core/script/function.c:119:can't find command `linux'.
error: ../../grub-core/script/function.c:119:can't find command `echo'.
error: ../../grub-core/script/function.c:119:can't find command `initrd'.

Environment

  • Red Hat Enterprise Linux 7 and later
    • UEFI
    • ReaR with backup on USB

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