matt@SHADOW:~$ sudo efibootmgr -c -w -l \\EFI\\ubuntu\\grubx64.efi -L "ubuntu" -p 1 -d /dev/sda 
[sudo] password for matt: 
** Warning ** : Boot0000 has same label ubuntu
** Warning ** : Boot0003 has same label ubuntu
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0002,0000,0003,0001
Boot0000* ubuntu
Boot0001* Windows Boot Manager
Boot0003* ubuntu
Boot0002* ubuntu