Remove old Linux kernels in Ubuntu

As time goes new kernel versions are released. After a kernel update old installed versions are not removed automatically, they are keep in case something goes wrong so you can boot again to a previous version.

linux-penguin-logo

But you may end up having lots of old versions you’ll never use. To remove them first you need to find all the installed versions:

$ dpkg -l | grep linux-image | grep -v extra | awk '{print $2}'
linux-image-3.16.0-30-generic
linux-image-3.16.0-31-generic
linux-image-3.16.0-34-generic
linux-image-3.16.0-37-generic
linux-image-3.16.0-43-generic
linux-image-generic-lts-utopic

Then remove all the unwanted versions using apt-get autoremove:

$ sudo apt-get autoremove linux-image-3.16.0-30-generic linux-image-3.16.0-31-generic linux-image-3.16.0-34-generic

You should probably leave at least the latests 2 versions just in case.

Ref: https://help.ubuntu.com/community/Lubuntu/Documentation/RemoveOldKernels

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