ubuntu@ubuntu:~$ sudo efibootmgr 
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 2001,2002,2003
Boot0000* ubuntu
Boot0001* USB HDD: KingstonDataTraveler 2.0
Boot0002* Unknown Device: 
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network