I had Refind bootloader in Macbook Air 2013-mid. My disk has OSX and broken Ubuntu. Ubuntu messed up my bootloader such that it starts only. I cannot go to grub/refind by pressing ALT, ALT-R, ... My SIP is disabled.
(proc) (hd0) (hd1) (hd3) (hd1,gpt4) (hd1,gpt2) (hd1,gpt1) error: failure reading sector 0x0 from `hd2'
hd1is my SSD find out by
(hd1,gpt1)EFI here, fat filesystem, probably swap size 20kB
(hd1,gpt2)75 GB here, probably OS X
(hd1,gpt3)Recovery HD, not sure what
(hd1,gpt4)Ubuntu 16.04, 45 Gb here
So I need to setup a bootloader which has
(hd1,gpt4) in the same table. I may still have
refind but not sure, because Ubuntu probably replaced it.
ls (hd1,gpt2)/ gives
error: unknown filesystem
I cannot configure the bootloader apparently back with Linux grub. If I could see the contents, I would like to do
set root='(hd1,gpt2)' ...
I really would like to start some live system to fix the thing, but I cannot find any key to boot from USB.
Updates in Linux side
I did many update and upgrade cycles on the Linux side. So the Linux kernel is now 4.4. In startup, I get only Grub menu where is no OS X. Just the Ubuntu and its variations.
So I think the problem is just to link the OS X to Grub but I am not sure about if when I could read OS X filesystem in
Unsuccessful attempt of installing refind in Linux
In Linux, install
sudo apt-add-repository ppa:rodsmith/refind sudo apt-get update sudo apt-get install refind
yes. Restart. However, Grub is still there but not refind.
How can you fix the bootloader in Macbook?