HAOS stuck on grub prompt after 18.2 update

Installation Home Assistant OS
1

I have an Intel NUK box which runs HAOS. After doing the update to 18.2 this morning in does not come back online. The screen shows a Grub prompt with not error message. Just:

grub>

Is there any cheat sheet on commands I can/should try?
Any troubleshooting docs?
How do I restore an update in such a case?

grub> ls
(hd0) (hd0.gpt8) (hd0.gpt7) (hd0.gpt6) (hd0.gpt5) (hd0.gpt4) (hd0.gpt3) (hd0.gpt2) (hd0.gpt1) (hd1) (hd1.gpt1)  (hd2)  (hd3)

grub> ls (hd0.gpt1)
 (hd0.gpt1): Filesystem is fat.

grub> ls (hd0.gpt2)
 (hd0.gpt2): Filesystem is squash4.

grub> ls (hd0.gpt3)
 (hd0.gpt3): Filesystem is unknown.

grub> ls (hd0.gpt4)
 (hd0.gpt4): Filesystem is squash4.

grub> ls (hd0.gpt5)
 (hd0.gpt5): Filesystem is unknown.

grub> ls (hd0.gpt6)
 (hd0.gpt6): Filesystem is unknown.

grub> ls (hd0.gpt7)
 (hd0.gpt7): Filesystem is ext2.

grub> ls (hd0.gpt8)
 (hd0.gpt8): Filesystem is ext2.
2

Have you tried turning it off and then turning it on again?

This sometimes happen on my PC which has 2 OSs installed. Haven’t seen this on my servers yet but nothing suggests that they would never run into this error.

3

Well … yes. dozens of reboots without help.

An idea on how to load this manually?

4

Then I don’t know, the problem goes away for me after restarting.

5

You could try to run this commands to read the grub config file if that exist on this location.

insmod part_gpt
insmod fat
configfile (hd0,gpt1)/EFI/BOOT/grub.cfg
6

It looked like the config file got corrupted. I decided to reinstall and restore the last backup.

7

GR8 That you get it working :grinning_face: