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Upon booting, directly after loading initramfs, the Kernel output consists only of small white blocks / a maximally garbled font.

Why that?

The system otherwise boots fine.

The font is also ok when I boot one of the recovery options in the Grub boot menu.

Also, I noticed the Grub Menu itself has a very low resolution, and does not have the purple background color anymore.

How to debug this?

For inspecting another boot issue, i have uncommented "quiet splash" as Kernel Boot Parameter in Grub, thats why I get to see the output.

System Information:

DMI: Dell Inc. OptiPlex 7010/0GXM1W, BIOS A28 02/22/2018
[    0.029870] smpboot: CPU0: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz (family: 0x6, model: 0x3a, stepping: 0x9)
[    1.680536] fbcon: inteldrmfb (fb0) is primary device
[    1.762673] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

grub-common is: 2.02~beta2-36ubuntu3.18
initramfs-tools is: 0.122ubuntu8.11
intel-microcode is: 3.20180425.1~ubuntu0.16.04.1
linux-firmware is: 1.173

Linux 4.16.11-041611-generic

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