Clean ubuntu

Clean /boot

Manual method

Kernel version

Get your current kernel version

uname -r

You should see something like:

3.13.0-32-generic

Installed kernels

Get a list of installed kernels

dpkg --list 'linux-image*'

You should see something like:

||/ Name Version Architecture Description

+++-===========================================-==========================-==========================-

===============================================================================

un linux-image <none> <none> (no description available)

un linux-image-3.0 <none> <none> (no description available)

rc linux-image-3.13.0-24-generic 3.13.0-24.47 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP

ii linux-image-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP

ii linux-image-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP

rc linux-image-extra-3.13.0-24-generic 3.13.0-24.47 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP

ii linux-image-extra-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP

ii linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP

ii linux-image-generic 3.13.0.32.38 amd64 Generic Linux kernel image

Delete the kernels you don't want/need anymore

apt-get remove linux-image-VERSION

Replace VERSION with the version of the kernel you want to remove.

When you're done removing the older kernels, you can run this to remove ever packages you won't need anymore:

sudo apt-get autoremove And finally you can run this to update grub kernel list:

sudo update-grub

sudo add-apt-repository ppa:caffeine-developers/ppa
sudo apt-get update && sudo apt-get install caffeine