[Cialug] /boot full -can't update

[Tom Sellers]

machine running Ubuntu 12.04 LTS

recommended to run sudo apt-get -f install however this process fails with the following:

linux-generic-pae : Depends: linux-headers-generic-pae (3.2.0.59.70) but 3.2.0.77.91 is installed
linux-image-generic-pae : Dependes: linux-image-3.2.0-59-generic-pae but it is not installed
E: Unmet dependencies. Try using -f.

df -h shows:

/dev/sda1                   228M  225M       0   100% /boot

How do I free up enough space to allow the update to complete?