Headless Ubuntu 20.04 change default Kernel

gegentierversuche

2/6/24, 9:38 AM

I agree this question had been asked before. I have tried one of them and I lost the connection so to be sure I am asking again.

I have a headless server which I can connect to only with SSH. After apt upgrade I realized that the new kernel can't work with our virtualization solution.

current kernel:

uname -r
5.4.0-137-generic

now I have to turn back to

5.4.0-121-generic.

sudo grub-mkconfig | grep -iE "menuentry 'Ubuntu, with Linux" | awk '{print i++ " : "$1, $2, $3, $4, $5, $6, $7}'

0 : menuentry 'Ubuntu, with Linux 5.4.0-137-generic' --class ubuntu
1 : menuentry 'Ubuntu, with Linux 5.4.0-137-generic (recovery mode)'
2 : menuentry 'Ubuntu, with Linux 5.4.0-121-generic' --class ubuntu
3 : menuentry 'Ubuntu, with Linux 5.4.0-121-generic (recovery mode)'

I have followed this one before

"modified GRUB_DEFAULT="1>2" value in /etc/default/grub executed below command to regenerate a grub config file with modified GRUB_DEFAULT settings."

update-grub
reboot

I could not access to my server again. This one is the second server with the same configuration and to be honest I am scared if things may happen again.

I need your help. What is the safest method to bypass 137 and automatically boot from 121 after reboot.

182

0 + 0

grub2

kernel

downgrade

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Headless Ubuntu 20.04 change default Kernel

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