[ubuntu] Update Issue (Not Enough Disk Space in Boot?)

Your system uses a separate partition on /boot (what you're calling your "hard drive" is actually just the primary system partition). What is taking up that space is previous keel versions. Every version of the keel is installed separately, on my system each version consist of 4 packages:

So the fix is to sudo apt-get purge the old keel versions you no longer need.

Check your ruing keel:

Check installed keel-related packages:
(Note that not all of these listed packages are old keels - some of them are just "meta-packages" for the latest keel. Look specifically at those packages explicitly including a version in the name, and be careful not to delete too much or you won't have a usable system.)

EDIT Oops, posting at the same time as oldfred...