This question already has an answer here:

/boot$ ls

abi-3.8.0-19-generic initrd.img-3.8.0-29-generic abi-3.8.0-25-generic lost+found abi-3.8.0-26-generic memtest86+.bin abi-3.8.0-27-generic memtest86+_multiboot.bin abi-3.8.0-29-generic System.map-3.8.0-19-generic abi-3.8.0-30-generic System.map-3.8.0-25-generic abi-3.8.0-31-generic System.map-3.8.0-26-generic config-3.8.0-19-generic System.map-3.8.0-27-generic config-3.8.0-25-generic System.map-3.8.0-29-generic config-3.8.0-26-generic System.map-3.8.0-30-generic config-3.8.0-27-generic System.map-3.8.0-31-generic config-3.8.0-29-generic vmlinuz-3.8.0-19-generic config-3.8.0-30-generic vmlinuz-3.8.0-25-generic config-3.8.0-31-generic vmlinuz-3.8.0-26-generic grub vmlinuz-3.8.0-27-generic initrd.img-3.8.0-19-generic vmlinuz-3.8.0-29-generic initrd.img-3.8.0-25-generic vmlinuz-3.8.0-30-generic initrd.img-3.8.0-26-generic vmlinuz-3.8.0-31-generic initrd.img-3.8.0-27-generic

marked as duplicate by Panther, user68186, karel, Rod Smith, Roman Raguet Nov 19 '13 at 15:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

My advice is to install Ubuntu Tweak to remove old kernels if you are unhappy or unwilling to remove them via the Terminal.

1 - Ubuntu Tweak Download

Once you have installed Ubuntu Tweak, open the application up.

2 - Click on Start Janitor

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Select Old Kernel & then click Clean

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Enter your password when asked, press enter and now only the old Linux Kernels will be removed.

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