Change kernel version from command line

Question

Is there a way to reboot with a different kernel version from the command line? I have Ubuntu PXE booted on a VM, and there is no graphical interface, but I need to downgrade the kernel (which is installed).

Answer 1

Edit your grub configuration as necessary - if you want to use it for longer, and install the new grub setup then to disk(s).

This I believe will help you understand grub configuration: https://help.ubuntu.com/community/Grub2/Setup

Otherwise I think kexec may also help you.

Install kexec with:

sudo apt-get install kexec-tools

Answer 2

• If you want to one-time reboot selection consider using grub-reboot command;
• If you want to set selection permanently use grub-set-default command.

Bot these commands require MENU-ITEM as parameter, for listing yours see: How to list GRUB's “menuentries” in command-line?

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But, you can always hold Shift while booting, to show Grub Menu, isn't it possible in your VM manager?