Hello John,
do you have the file ubuntu-esm-apps.list in your root directory?
Here is the full path:
/var/lib/ubuntu-advantage/apt-esm/etc/apt/sources.list.d/ubuntu-esm-apps.list
If so, open the file with an editor of your choice and root rights.
The lines with deb in front of them must be commented out using #.
Then save, close the file, restart and reload the sources.
This is what my ubuntu-esm-apps.list looks like now:
