Looks like those packages are in the experimental debian repository..

They do appear to be missing from my repo and the tspre repo. Try adding the following to your sources.list:

deb http://ftp.us.debian.org/debian/ experimental main
deb-src http://ftp.us.debian.org/debian/ experimental main

And then apt-get update, and apt-get install e17. You may want to remove experimental after that.. since it is, well, experimental.