Recover MacBook after bad kernel compile

Recover MacBook after bad kernel compile | Generated by AI

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Question: MacBook Pro 2017 running Ubuntu cannot boot after compiling a Linux kernel. How to recover?

Answer:

Yes, this is a common situation. A MacBook Pro 2017 (Intel) can run Ubuntu, but after manually compiling a kernel, a bad kernel configuration or missing Apple-specific drivers can make it fail to boot.

The good news: your data is probably still there. You mainly need to boot an older kernel or repair GRUB.

1. First try GRUB recovery

Power on the MacBook and immediately hold:

Option (⌥) key

You should see Apple’s boot picker.

Choose:

EFI Boot

Then in GRUB:

Press:

Esc

or hold:

Shift

You should see:

Ubuntu
Advanced options for Ubuntu

Select:

Advanced options for Ubuntu

Then choose the previous kernel:

Example:

Ubuntu, with Linux 6.8.0-xx-generic
Ubuntu, with Linux 6.8.0-xx-generic (recovery mode)
Ubuntu, with Linux 6.6.x

Boot the older one.

2. If you can boot the old kernel

Check installed kernels:

dpkg --list | grep linux-image

Example:

linux-image-6.8.0-40-generic
linux-image-6.8.0-custom

Remove the broken kernel:

sudo apt remove linux-image-6.8.0-custom
sudo update-grub

3. If no kernel boots: use Ubuntu live USB

Boot from USB:

Power on
hold Option (⌥)
select EFI Boot

Mount your Ubuntu partition:

sudo fdisk -l

Example:

/dev/nvme0n1p2   Linux filesystem

Mount:

sudo mount /dev/nvme0n1p2 /mnt

Mount EFI:

sudo mount /dev/nvme0n1p1 /mnt/boot/efi

Enter your system:

sudo chroot /mnt

Then:

update-grub

or reinstall kernel:

apt install --reinstall linux-image-generic linux-headers-generic

Exit:

exit
sudo reboot

4. Why compiling kernel breaks MacBook Pro boot

MacBook Pro 2017 hardware needs several kernel options:

Important:

CONFIG_EFI=y
CONFIG_EFI_STUB=y

CONFIG_NVME_CORE=y
CONFIG_NVME=y

CONFIG_HID_APPLE=y
CONFIG_BCM5974=y

CONFIG_DRM_AMDGPU=y   (if Radeon Pro model)
CONFIG_DRM_I915=y     (Intel graphics)

Common mistakes:

Missing EFI support

The Mac boots through EFI:

Mac EFI firmware
        |
        v
Linux EFI stub
        |
        v
Kernel

If:

CONFIG_EFI_STUB=n

the Mac cannot start the kernel.

Missing NVMe driver

The SSD needs:

CONFIG_NVME_CORE
CONFIG_BLK_DEV_NVME

Otherwise:

Kernel starts
        |
        X
cannot find root filesystem

Wrong initramfs

After installing your custom kernel:

sudo update-initramfs -c -k <kernel-version>
sudo update-grub

Without initramfs, drivers needed before mounting / may be missing.

5. For future kernel compilation

On Ubuntu, start from the current config:

cp /boot/config-$(uname -r) .config

Then:

make olddefconfig
make -j$(nproc)
sudo make modules_install
sudo make install
sudo update-grub

This keeps Apple-required options.

The key question is: what exactly happens when you boot now?

Examples:

Black screen immediately?
GRUB appears but kernel says unable to mount root fs?
Kernel panic?
Stuck at Apple logo?
Drops into initramfs shell?

Also tell me the exact MacBook Pro 2017 model:

13-inch Intel only?
15-inch with Radeon Pro GPU?
Ubuntu version?
Kernel version you compiled?

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