How to Fix Oracle JDK 7 is NOT installed

Setting up oracle-java7-installer (7u3-0~eugenesan~precise4) ...
Downloading...
--2012-06-09 11:03:54--  http://download.oracle.com/otn-pub/java/jdk/7u3-b04/jdk-7u3-linux-i586.tar.gz
Resolving download.oracle.com (download.oracle.com)... 58.26.1.35, 58.26.1.64
Connecting to download.oracle.com (download.oracle.com)|58.26.1.35|:80... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: https://edelivery.oracle.com/otn-pub/java/jdk/7u3-b04/jdk-7u3-linux-i586.tar.gz [following]
--2012-06-09 11:03:54--  https://edelivery.oracle.com/otn-pub/java/jdk/7u3-b04/jdk-7u3-linux-i586.tar.gz
Resolving edelivery.oracle.com (edelivery.oracle.com)... 173.222.154.174
Connecting to edelivery.oracle.com (edelivery.oracle.com)|173.222.154.174|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: http://download.oracle.com/errors/download-fail-1505220.html [following]
--2012-06-09 11:03:55--  http://download.oracle.com/errors/download-fail-1505220.html
Connecting to download.oracle.com (download.oracle.com)|58.26.1.35|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5307 (5.2K) [text/html]
Saving to: `./jdk-7u3-linux-i586.tar.gz'

     0K .....                                                 100%  147K=0.04s

2012-06-09 11:03:55 (147 KB/s) - `./jdk-7u3-linux-i586.tar.gz' saved [5307/5307]

Download done.
sha256sum mismatch jdk-7u3-linux-i586.tar.gz
Oracle JDK 7 is NOT installed.
dpkg: error processing oracle-java7-installer (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 oracle-java7-installer
E: Sub-process /usr/bin/dpkg returned an error code (1)



How to fix this problem ??

one by one on terminal

sudo rm /var/lib/dpkg/info/oracle-java7-installer*
sudo apt-get purge oracle-java7-installer*
sudo rm /etc/apt/sources.list.d/*java*
sudo apt-get update
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

or

sudo rm /var/lib/dpkg/info/oracle-java7-installer*; sudo apt-get purge oracle-java7-installer*; sudo rm /etc/apt/sources.list.d/*java*; sudo apt-get update; sudo add-apt-repository ppa:webupd8team/java; sudo apt-get update; sudo apt-get install oracle-java7-installer;

work fine on my ubuntu 12.04