Adobe Flash installation help

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http://askubuntu.com – So I'm trying to install adobe flash and I'm quite new at all this. I've googled around but i can't find any sources that have worked. Right now im at https://help.ubuntu.com/community/Java and when i click install links i get sent to an error page that says "Firefox can't find the file at apt://openjdk-7-jre." so what do i do? (HowTos)