I’m struggling to figure out how to debug a problem booting my laptop, any hints appreciated.
Summary
- Ubuntu 24LTS / kernel 6.11.0-26-generic (same happens with -25)
- hangs during boot, possibly due to recent UEFI firmware update (have checked secure boot is still disabled)
- I sometimes get FAILED nvidia Load/Save screen backlight errors in the system log but not always so don’t think this is relevant. Nothing stands out in the boot log.
- using the same machine to boot from an external drive with a newly installed Ub 24LTS and the same kernel and fully updated packages WORKS (so either not UEFI update related or possibly some driver update on the internal drive that is affected by that?)
- I can boot to recovery mode ok
- disk has no errors
I may go ahead re-install and setup from scratch but would like to know how to debug this anyway but the web is not being very helpful.
I haven’t installed anything new just lately but may have updated some packages, and of course the UEFI firmware change seems susptect but I’m not sure what else to try.
4 Likes
You might try this:
Here’s a more hand’s on approach (no rescue image/disk):
Thanks - it’s not a problem with grub as I understand it. I can select what to boot and it is hanging long after loading but it isn’t clear from the logs I’ve looked at where the issue is.
So it’s help with isolating a driver update or service etc that I need.
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A kernel update or swap might help. If newer firmware update and existing kernel is having issues with it.
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What is the exact make and model of the laptop?
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Both the clean external install (which boots) and the internal installation (which hangs) are using the same kernel version, and both have some errors in the start up messages, including a couple like this which could be related to the UEFI update:
2025-06-25T14:20:20.572478+01:00 Lunar kernel: ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - \_SB_.PC00.LPCB.H_EC.CHRG (20240322/dspkginit-438)
I don’t think this is an issue based on my searches and the fact that one system still boots despite that.
I don’t reboot every day, so it is possible the issue was dormant and related to an earlier update. I’ve not installed anything obviously suspect in a while but may have updated things like Nvidia display or CUDA drivers.
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And this is where your world of pain likely began.
Maybe, anyway I shall try removing them now and report back.
The magic command for anyone who hits this (from Nvidia website):
# apt remove --purge "*cuda*" "*cublas*" "*cufft*" "*cufile*" "*curand*" "*cusolver*" "*cusparse*" "*gds-tools*" "*npp*" "*nvjpeg*" "nsight*" "*nvvm*"
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Been there, bastards never sent me a T-shirt though…
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Which integrated nvidia card does that model have?
Could be a wonderful opportunity to try something refreshingly minty 
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