Since PhpStorm works much faster with Oracle version of Java and Oracle JRE is not directly supported in Ubuntu here are 3 short steps how to get it:

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sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java7-installer

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That's it... don't be a hero like me and try to run PhpStorm with OpenJRE, it is really slow :(

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