Ubuntu: How do I boot into an older kernel? [duplicate]



Question:

This question already has an answer here:

I install new kernel (from launchpad mainline kernel) in my Ubuntu 12.04, in order to test some issues I'm having.

Now, older kernels don't appear in the list at boot, just the new kernel. I can boot from the old kernel changing boot parameters at grub time, but I rather like to have a list entry I can select.


Solution:1

Are the older ones not in the Previous kernel list? Assuming you have recovery mode - that would be the third menu entry.

Check that they actually exist in the grub.cfg file

cat /boot/grub/grub.cfg  |grep menuentry  


Solution:2

For Grub (nor Grub2) edit /boot/grub/menu.lst

gksu gedit /boot/grub/menu.lst  

Search for this line howmany . If doesn't exists, add it: The value holds the amount of kernals are shown on the boot menu.

 # howmany=all  

Update GRUB afterwards

sudo update-grub  

Tweak Grub

Tweak Grub 2


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