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I have tried the bootrec fixmbr and fixboot method, I've tried the n60 method, I've even tried removing from a Ubuntu live usb. All fixes are temporary. I can boot into Windows 8.1 no problem but in the bios, the ubuntu boot option persists.

I've tried easybcd to remove the option and it just returns after a reboot. It's not an empty option either. If I set the boot option #1 or boot override to ubuntu, it boots into grub and I have to reboot and force windows to boot through the bios.

I have 3 partitions on my harddrive, all windows created.

Disk Management screenshot, from Windows

(Full size screenshot showing disks and partitions here.)

These are the entries for the computer's (only) hard disk shown:

hard disk partitions

I deleted anything Ubuntu related using OS Uninstaller within a live usb of Ubuntu. How does grub/ubuntu in the bios keep returning? I just want to completely nuke it.

Thank you!

The Ubuntu Boot Option in the BIOS persists no matter what:

photo of screen showing this is really in the BIOS and not in GRUB

(Full size here.)

Eliah Kagan
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user236851
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1 Answers1

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edit I made this answer after Eliah suggested I do so, however he has removed his comment in the meantime.

I suggest using efibootmgr to delete the entry:

sudo apt-get install efibootmgr

Please read its man page before doing anything with it:

man efibootmgr

The following excerpts are direct quotes from the man page and give some good clues about the use of efibootmgr:

Displaying the current settings (must be root).

$ sudo efibootmgr
BootCurrent: 0004
BootNext: 0003
BootOrder: 0004,0000,0001,0002,0003
Timeout: 30 seconds
Boot0000* Diskette Drive(device:0)
Boot0001* CD-ROM Drive(device:FF)
Boot0002* Hard Drive(Device:80)/HD(Part1,Sig00112233)
Boot0003* PXE Boot: MAC(00D0B7C15D91)
Boot0004* Linux

This shows:

  • BootCurrent - the boot entry used to start the currently running system

  • BootOrder - the boot order as would appear in the boot manager. The boot manager tries to boot the first active entry in this list. If unsuccessful, it tries the next entry, and so on.

  • BootNext - the boot entry which is scheduled to be run on next boot. This supercedes BootOrder for one boot only, and is deleted by the boot manager after first use. This allows you to change the next boot behavior without changing BootOrder.

  • Timeout - the time in seconds between when the boot manager appears on the screen until when it automatically chooses the startup value from BootNext or BootOrder.

  • Five boot entries (0000 - 0004), along with the active/inactive flag (* means active) and the name displayed on the screen.

Following are several examples at the bottom of the man page, with two of them being especially helpful:

3. Changing the Boot Order

Assuming the configuration in Example #1, 

efibootmgr -o 3,4

could be called to specify PXE boot first, then Linux boot.

5. Deleting a boot option

Assuming the configuration in Example #1, 

efibootmgr -b 4 -B

could be called to delete entry 4 and remove it from the BootOrder.

Conclusion

The number you specify relates to the last number in the 4-digits-figure provided by sudo efibootmgr.

henry
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