I have Ubuntu 12.04 with a boot partition. I had a friend set it up as I am a total novice at this. After routine package updates over the past 6 six months, they fail now. I read through the forum and realize I need to delete old kernel images that have been accumulating over the past several months. However, I have tried several commands from solutions posted in other threads in the terminal to remove them and they all fail (purge, remove, autoremove). I also tried to install UBUNTU Tweak and the install failed. I could use some detailed help to remove these packages so I can continue the package updates.