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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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How to solve this boot error message? (lemmy.world)

submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]

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I'm on debian 11, this error doesn't show up every time, but once it appear I need more that one reboot and it will fix automatically without doing nothing, don't know the reason why (just read that can be kernel dependent). What I want to avoid is that maybe it's just a warning of somethink that will cause a pc break in future (maybe hardware is starting working bad?) Do you have any sugggestion? Thanks

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[–] [email protected] 8 points 11 months ago* (last edited 11 months ago) (1 children)

By default, your grub menu should show up every time you boot.
If it doesn't, boot your PC and do:
sudo nano /etc/default/grub
You need these lines:
GRUB_TIMEOUT=10
GRUB_TIMEOUT_STYLE=menu

Every line starting with:
GRUB_HIDDEN_TIMEOUT
should be commented out like so:
#GRUB_HIDDEN_TIMEOUT

Then run sudo update-grub and reboot.

What this does:

sets a countdown of 10 seconds before grub boots the kernel
tells grub to show the boot menu during that countdown
doesn't use a hidden countdown that waits for a button press to show the menu

In the grub menu, select advanced options and there you should be able to select an older kernel to boot.

[–] [email protected] 3 points 11 months ago* (last edited 11 months ago) (1 children)

ok, thank you very much for detailed explanation, yes I remember that I had removed timeout from grub in the past, I will follow your procedure and select previous kernel. Another question, once I'v selected the older kernel did you think that removing (it's fine using apt?) and resinstall newest kernel will fix the issue or I'v to keep the older kernel? In case I'v to keep the older kernel how can I avoid that it will be overwritten once I update the os?

[–] [email protected] 5 points 11 months ago* (last edited 11 months ago) (1 children)

I think the newer kernel should work after reinstallation.
If it doesn't and you want to stay with the older one:

apt list --installed linux-image*

There should be a package with a specific version number in its name. For example, the standard kernel for Debian 11 is:
linux-image-5.10.0-26-amd64

Uninstall the linux-image-... package you don't want to keep.
Also uninstall linux-image-amd64 which is the meta-package that pulls in the newest kernel version. Without it, you won't get new kernel versions in upgrades.

[–] [email protected] 5 points 11 months ago

ok, will try Many Thanks!!