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pottewar nagalaxmi's questions

Martin Hope
pottewar nagalaxmi
Asked: 2019-11-11 23:12:35 +0800 CST
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While changing the boot order using the efibootmgr -o command, I am facing duplication of UEFI items after reboot. Please see below for the steps I followed.

  1. Boot to OS (I used Ubuntu 18.10):

    root@XXX:~$ efibootmgr
BootCurrent: 0001
Timeout: 3 seconds
BootOrder: 0001,0002, 0003
Boot0001* UEFI: Built-in EFI Shell
Boot0002* UEFI: hp x705w PMAP, Partition 1
Boot0003* Hard Drive

  2. Now modify the boot order:

    root@XXX: ~$ efibootmgr -o 2, 3
BootCurrent: 0001
Timeout: 3 seconds
BootOrder: 0002, 003
Boot0001* UEFI: Built-in EFI Shell
Boot0002* UEFI: hp x705w PMAP, Partition 1
Boot0003* Hard Drive

  3. Reboot and check. There will be duplication found for UEFI: Built-in EFI Shell:

    root@XXX: ~$ efibootmgr 
BootCurrent: 0001
Timeout: 3 seconds
BootOrder: 0004, 0002, 0003, 0001
**Boot0001* UEFI: Built-in EFI Shell**
Boot0002* UEFI: hp x705w PMAP, Partition 1
Boot0003* Hard Drive
**Boot0004* UEFI: Built-in EFI Shell**

I request someone's help to understand why this duplication happens.

NOTE: The duplication happens only for the devices that are been skipped while changing the boot order.

efibootmgr