1). Install Java (Use Sun JDK. OpenJDK is NOT recommended as the JDK.)
It seems sun-java5-jdk is no longer available now. Refer Oracle Java SE Downloads for Linux and it's installation instructions. Keep the path in your memory; you'll need it when setting up $JDK_HOME path variable.
Then, to make sure that it is installed properly, type
java -version
if the version shows, then it is installed successfully.
2) Now, install IDEA
Download IntelliJ IDEA from the below link
http://www.jetbrains.com/idea/download/index.html#linux
Unpack the downloaded archive (ideaIU-9.0.3.tar.gz) by,
tar xfz ideaIU-9.0.3.tar.gz
(match the file name to your version!)
Move the extracted archive to /usr/lib
sudo mv idea-IU-95.429 /usr/lib
3) Configure PATH variables for JDK_HOME and IDEA
sudo gedit ~/.bashrc
Add following for JDK_HOME to the file, make sure to change the path to reflect your java installation directory.
export JDK_HOME=/usr/lib/jvm/java-6-sun
Append the line for PATH variable with this, /usr/lib/idea-IU-95.429/bin . Finally, it should look like this.
export PATH=$PATH:/usr/lib/idea-IU-95.429/bin
Now, run `source ~/.bashrc` to take effect the changes.
Now, run `source ~/.bashrc` to take effect the changes.
4) Run IDEA by entering following in the terminal
idea.sh (or sh idea.sh)
NOTE: If you get permission denied error, then you will have to set the correct permissions to idea.sh file by `sudo chmod 755 /usr/lib/idea-IU-95.429/bin/idea.sh`
For easier execution, create a "Custom Application Launcher" at top panel. Access it via; right-click the top Panel -> "Add to Panel" -> double click "Custom Application Launcher". Browse and give an icon if you like. Then, use a command similar to,
sh /usr/share/idea-IU-95.66/bin/idea.sh
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| Custom Application Launcher Properties |
If you have any problem in setting up this, drop a comment below. Well, even if you got right, just tell me so. Love to hear that too! :). Good Luck!

