Have too many old kernels installed or running out of /boot space?

If you have every had a server online for some time. You've probably updated it a couple of times and maybe noticed that the old kernels stay loaded in /boot partition. Well eventually you will run out of space in your /boot partition and need to clear out those old kernels.
 
Don't just take my word for it, take a look yourself and to see how many old kernels you have by running the following command (excluding current kernel of course).
 

 
As you can see there are a couple old kernels stored in your /boot. So how do you get rid of them and free up a little space, same command as above just adding on apt-get purge.
 

 
Now you've freed up some space in your /boot partition and should be good to go for some more wonderful updates!
 

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    I typically try and keep the blog up-to-date but apparently I'm not very good at posting!