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I know number of ways to remove old kernel versions manually. Is there any way to remove old kernel versions automatically? Automatically, in the sense i don't have to do the same thing each time the kernel gets updated.

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Or, to expand the question. Is there a way to keep only two versions of the kernel installed (the new one and the last one, just in case) automatically?. – Javier Rivera Feb 15 '12 at 9:29
possible duplicate of Is there a way to remove/hide old kernel versions? – Jorge Castro Feb 17 '12 at 21:43

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You can follow the Using the "unattended-upgrades" package section of Automatic Security Updates article on Ubuntu Wiki to perform this.

You need to change the following line in /etc/apt/apt.conf.d/50unattended-upgrades file;

//Unattended-Upgrade::Remove-Unused-Dependencies "false";

with

Unattended-Upgrade::Remove-Unused-Dependencies "true";

to automatically remove old packages, including kernels.

Also remove or comment the line

"^linux-image.*";

in the "NeverAutoRemove" section of the file /etc/apt/apt.conf.d/01autoremove.

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I did this but it was still collecting 3+ old kernels consuming 100's of MBs. So I added apt-get autoremove to my daily cron job that actually does the upgrades, since it doesn't always go through built-in update-manager. – Marcos Aug 24 '12 at 12:01

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