this is my first time using linux ubuntu. I'm trying to install java, i downloaded the file from the java website, extracted the file to the desktop and the extracted file's name now is jre1.7.0_45
i'm following this to install the java http://www.wikihow.com/Install-Java-on-Ubuntu
but omg i can't even get past number 2. i get
Reading package lists... Done
Building dependency tree
E: Unable to locate package openjdk-7-jre
how can i do this please?