If you want to remove oracle-jdk7-installer, you can simply go to /var/lib/dpkg/info/ It takes some time to load, and delete all files which starts with oracle-java7*** there was ~6files, then go to Synaptic and simply locate same oracle-jdk and click remove/completly remove.

This is where I found it: /ubuntuforums.org/showthread.php?p=11821814

Good luck!

Edit: here are the 3 steps to easily do this:

Open a terminal (ctrl + alt + T) and type those two commands successively:

cd /var/lib/dpkg/info/
sudo rm oracle-java7-installer*
Open synaptic, search for "oracle-java7-installer", mark it for complete removal and click "apply".

Реально помогает удалить этот косяк.