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I have. a simple question. After I updated my kernel, I couldn't boot (stuck on purple screen) unless I chose the old kernel. So how do I delete the new kernel with synaptic. And how do I do this safely? I'm in Quantal Quetzel. My kernel is 3.5.0-40. The working kernel is 3.5.0-39. Also, how do I stop kernel updates from appearing in the update manager? Thanks.

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what is the version of the Kernel? you want to remove? – mojo706 Sep 8 '13 at 20:41
My kernel is 3.5.0-40 – Dave Sep 8 '13 at 20:52
If you'd prefer answers to include information about preventing the new kernel from being installed again with your other updates, you might want to include that in your question. – Eliah Kagan Sep 9 '13 at 0:25
I think it is not wise to delete the kernel or to stop kernel updates, as they are usually security updates. See this question about a better practice. – jarno Dec 27 '15 at 15:08
up vote 9 down vote accepted

To safely remove the unwanted kernel, open a terminal session and run the command:

Find the kernel package name

dpkg -l | grep 3.5.0-40

On amd64/x86_64 it is linux-image-3.5.0-40-generic.

Remove (purge - remove all configuration files as well)

sudo apt-get purge linux-image-3.5.0-40-generic

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Thanks I'll try that tomorrow and post back. Ty. :) – Dave Sep 8 '13 at 21:13
Oh don't I need to do sudo update-grub after that? – Dave Sep 8 '13 at 21:15
The postrm script of the package will update grub for you when you remove (purge) it;-) – Terry Wang Sep 8 '13 at 21:18
Thanks Terry that fixed my problem. Now how do I keep kernel updates out of the update manager? – Dave Sep 9 '13 at 13:26
sudo apt-get update && apt-get dist-upgrade -y, not sure if you have linux-current-generic or linux-image-generic-lts-raring on non-LTS releases. – Terry Wang Sep 9 '13 at 13:34
sudo apt-get remove linux-image-3.5.0-40*.

I will suggest you always keep at least one older kernel available, just in case you need to boot into it for reasons you may never expect right now.

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Ik that about keeping the kernels. Very important stuff. I have one other besides this one. Ty I'll try it tomorrow and post back. – Dave Sep 8 '13 at 21:14

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