Where are the libraries on Linux!?

Hi Folks,

I am trying to find where the libraries are stored on the linux version of the arduino IDE.

I Know on windows I can just drag whathever library into the libraries folder, but on arduino I have to import the zip file.
Even worse, if I no go to the libraries folder, only the default libraries are there, even tough I installed a few and they show up on the IDE.

I wanted to make a few changes to a library, but cant find the files. Any help?

Should be sketchbook/libraries for user libraries.

Thank you