How set default Kernal boot in Ubuntu

Question

I want to default boot an older Kernal of Ubuntu, what is the best way to do this?

Answer 1

Edit menu.lst in /boot/grub/
And set the 'default 0' to the number of the entry you want

Answer 2

You can select the default kernel by editing /boot/grub/menu.lst and changing

default 0

to the index of the kernel you want on the list, e.g. default 3 would load the fourth kernel.

If you want to be more dynamical, you can save the latest selection as the default by changing the line above to say default saved and enable the savedefault setting in the automagic kernel list by changing # savedefault=false to # savedefault=true. Remember not to uncomment the line! This change needs to be activated by running sudo update-grub.

After that, whichever kernel you choose to boot, will be the default selection next time.