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(works on Slackware 14.2+, not tested on 14.1 and before)

View EFI boot menu contents

efibootmgr

Will return something like:

BootCurrent: 0001
Timeout: 10 seconds
BootOrder: 0000,0001,0004,9999
Boot0000* Windows Boot Manager
Boot0001* Slackware
Boot0004* Internal Hard Disk
Boot9999* USB Drive (UEFI)

Change EFI boot order

sudo efibootmgr -o 0001,0000,0004,9999

Will return something like:

BootCurrent: 0001
Timeout: 10 seconds
BootOrder: 0001,0000,0004,9999
Boot0000* Windows Boot Manager
Boot0001* Slackware
Boot0004* Internal Hard Disk
Boot9999* USB Drive (UEFI)

Remove old EFI menu items

When you remove/replace old OS installs, the EFI boot menu retains references to them. To remove these old references:

List the current boot entries:

efibootmgr

Then delete the desired entry:

efibootmgr -Bb 0000

Sources


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