Modify the default boot order in GRUB

My Chromebook running Debian requires a less-than-recent kernel (3.13.10) that supports compiling modules for the laptop's touchpad. After installing a kernel retrieved from the GRUB boot manager auto-generates a menuentry for the new kernel but defaults to booting the most recent kernel available.

To change GRUB boot order to default to a specific (touchpad-friendly) kernel:

0. Install a (less-than-current) Debian-packaged kernel

I am running Debian's sid (unstable) branch and the 3.13.X kernel is no longer available in the package manager. I download the kernel headers and image and install the packages using dpkg ...

$ wget
$ sudo dpkg -i linux-kbuild-3.13_3.13.6-1_amd64.deb
$ wget
$ sudo dpkg -i linux-headers-3.13-1-common_3.13.10-1_amd64.deb
$ wget
$ sudo dpkg -i linux-headers-3.13-1-amd64_3.13.10-1_amd64.deb
$ wget
$ sudo dpkg -i linux-image-3.13-1-amd64_3.13.10-1_amd64.deb

A menuentry for the new kernel is auto-generated in /boot/grub/grub.cfg.

1. Retrieve the kernel menuentry

Inside grub.cfg there is an option for submenu 'Advanced options for Debian GNU/Linux' and beneath it multiple menuentries for installed kernels and boot options. Using my Chromebook's 3.13.10 kernel as an example the relevant entry is ...

menuentry 'Debian GNU/Linux, with Linux 3.13-1-amd64'

This will be designated as the new default kernel to boot.

2. Set default kernel

Open /etc/default/grub in an editor and modify GRUB_DEFAULT= (set to '0' or most recent by default) to the new desired boot kernel. In the case of my Chromebook I include the submenu + menuentry in the modified setting ...

GRUB_DEFAULT="Advanced options for Debian GNU/Linux>Debian GNU/Linux, with Linux 3.13-1-amd64"

Run sudo update-grub to generate a new config and reboot. At the GRUB splash screen the Advanced options for Debian GNU menu will be the new default and the designated kernel will load.

Happy hacking!

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