Clean up /boot on Ubuntu

ubuntu-clean-boot.sh

#
# Taken from: https://askubuntu.com/questions/345588/what-is-the-safest-way-to-clean-up-boot-partition
#

# Command line method:
# First check your kernel version, so you won't delete the in-use kernel image, running:

uname -r

# Now run this command for a list of installed kernels:

dpkg --list 'linux-image*' | grep ^ii
# and delete the kernels you don't want/need anymore by running this:

sudo 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