sudo su
#you will be prompted for a password
apt-get install packagename
#I believe e17 is a tar.gz that you have to download. In this case,
wget link to file
dpkg -i e17.tar.gz (or whatever it named the file as)
The main reason I didn't keep Ubuntu is because for the life of me I can not understand the Terminal stuff. I have no idea how to download/install/get anything. So right now I'm sitting with a bare-bone OS and don't know how to work it...hmm...