Okay, I think the Ubuntu Tweak Tool would be even better. I'm looking for the simpler way to delete all those old kernels, or at least most of them. After successfully deleting and freeing up space, then the update/upgrade/dist-upgrade will work, I hope. So, let's get the tweak tool:
Code:
sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak