Whip open a terminal and run uname -r to get the current kernel version. Open Synaptic and search for linux-image- and organize by installed components. Leave the current kernel (obviously) and the previous kernel, select all the other images and mark them for complete removal. Apply changes, let it do its thing, and boom–all cleaned up. If you dual boot, like I do, you may want to run Startup Manager and make sure your default choice is correct.
1 August 2010