Recently apt-get install -y oracle-java7-installer
stopped working.
I know in their roadmap, I think the public version is no longer supported, but it\'s be
As Oracle support for debian packages has gone quite a while ago, I suppose that you use the method of webupd8
Go to their instructions I linked before and check if your configuration is still valid.
They also provide a method to install Java 8: Install Oracle Java 8 in Ubuntu (Debian instructions linked from there.)
Edit: I think that Oracle does not provide a public download of Java 7 anylonger - you would have to download it from the Java Archive. (http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html)
You could try to download the rpm package and use alien
to convert it to a .deb package. And did you already consider updating to Java 8?