My MacBook won't boot to macOS anymore, only on Linux (Ubuntu). Even restarting with pressing alt doesn't show the macOS disk option anymore.
Here is what happened:
- I set up a dual boot High Siera / Ubuntu 16 on my laptop with rEFInd boot manager. Everything worked fine.
- I created a new partition from Mac using Disk Utility to be both accessible from Mac and Linux (I chose the exFat format). I got a double message popup before to confirm (see below).
- The partition was created successfully, I copied some data from my Mac, and did a reboot on Linux to confirm I can access it. It worked well.
- From there I couldn't boot on my Mac anymore, the icon was gone at startup time. I can boot on Linux but not on Mac.
Popup Messages during partition creation:
Partitioning this device will change some of the partitions. No partitions will be erased. This partition will be added "New partition" This partition will be resized "Existing partition" "Cancel" or "Partition" Boot drive repartitioning: This partition operation is modifying your boot volume. When the boot volume is resizing the screen may freeze potentially for long periods. Do not power your computer off while resizing is occuring. "Cancel" or "continue"
Before the reboot, macOS was working fine. But after the reboot, the macOS option was gone.
Any idea how to fix this?
$ fdisk -l Device Start End Sectors Size Type /dev/sda1 40 409639 409600 200M EFI System /dev/sda2 409640 911627655 911218016 434,5G unknown /dev/sda4 927225856 934842367 7616512 3,6G Linux swap /dev/sda5 934842368 977104895 42262528 20,2G Linux filesystem