Set Default Kernel entry in GRUB2

Problem:

After installing Wireguard in Ubuntu 18.04. the kernel vesrion 5.3.0.1026.13 (linux-image-gke-5.3) is automatically installed, as well. However on my system it broke several things like display-resolution and keyboard…

So i’d like to reset the former kernel linux-image-generic 4.15.0.106.94 as the new default kernel in GRUB 2 again.

Solution:

1) Backup grub config file:

> sudo cp /etc/default/grub /etc/default/grub.bak

2) Edit /etc/default/grub and set to:

GRUB_DEFAULT=”Advanced options for Ubuntu>Kernel description”

eg:

GRUB_DEFAULT=”Advanced options for Ubuntu>Advanced options for Ubuntu>Ubuntu, with Linux 4.15.0-106-generic””

3) Update grub

> sudo update-grub

see: Askubuntu.com: Set older kernel as default grub entry

Resources:

GRUB2 Configuration/
Delete a non-working kernel

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