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I am new to Linux.

We have a Linux server and we have only CLI access. We need to change the kernel for some specific reason. Suppose that the server has an old kernel and a new kernel available. We know that old kernel can boot your system correctly and you want to test new kernel.

How to test this without crashing the server? I have read many articles and don't understand any of them.

https://www.gnu.org/software/grub/manual/legacy/Booting-once_002donly.html
https://www.gnu.org/software/grub/manual/legacy/Booting-fallback-systems.html

karel
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jubojet
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  • You've provided few specifics; Ubuntu 20.04 LTS was a LTS release thus has a choice of kernel stacks, but you've given no specifics as to which you're using, and what you're trying to revert to. Switching stacks maybe a better option than using an unpatched kernel, especially if the change you're having relates to the recent kernel stack change - but you weren't specific with details on what you're using. I suggest you be specific. – guiverc Oct 17 '22 at 07:27
  • hey we are installing a azure migrate agent in our costumer environment and their are specific kernel version this agent supports below is the link for the supported kernel and the costumer has 5.04.0-128-generic and we are trying to upgrade to 5.04.0-121-generic or 5.04.0-122-generic but we dont know this is a stable kernel or not so their is a option to try newer kernel called Booting once-only but i am not able to setup . – jubojet Oct 17 '22 at 08:54

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