I can\'t install oracle java 7 following the steps provided in this link: http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html
sudo ad
i think that your download is corrupted you have to remove the corrupted package first by code :
sudo apt-get purge oracle-java7-installer
clean your apt :
sudo apt clean
remove and reimport the ropsitory:
sudo add-apt-repository --remove ppa:webupd8team/java
sudo apt-get update
sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
install your package again :
sudo apt-get install oracle-java7-installer
enjoy it bro ! if the problem hasn't solved try using VPN . Maybe there is a filtering between you and the oracle website