Ubuntu – How to boot with an older kernel version

grub2kernel

The latest kernel is causing problems with my sound, which worked fine with an older version. As I have only Ubuntu installed, Grub is not getting displayed while booting. How can I manually choose my kernel version while booting?

Best Answer

The simplest way to display your Grub is to press and hold the SHIFT button while booting.

As an alternative, you can always display Grub without it booting any particular kernel:

gksudo gedit /etc/default/grub

change GRUB_TIMEOUT to -1 and comment out GRUB_HIDDEN_TIMEOUT

finish off by running

sudo update-grub

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Ubuntu – What to do if I upgarde to the latest version and the only available kernel does not work

Unless you manually deleted the old kernel, you will still have these on your machine.

Hold down the Shift key as you boot up and it will take you to the Grub screen. From here, you can choose which version of the kernel to boot into.

If you really don't need the newer ones you can find which kernel you're currently using by going to the terminal and running

uname -r

to see which kernel you're using. Then run

dpkg -l | grep linux-image

and note the kernel versions you don't need anymore (anything starting 3.5 I guess but if the kernel you're running works fine, you can get read of all the others). Then you can run

sudo apt-get purge linux-image-3.5.x-xx-generic

That should free up some disk space for you too

Best Answer

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Ubuntu – What to do if I upgarde to the latest version and the only available kernel does not work

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