install CDT in eclipse with JEE

[esolve]

I'm using ubuntu
my eclipse is now with JAVE EE
I want to install CDT into it
are there any good procedures?

are there any problems/bugs if CDT coexist with JEE in eclipse?

my Eclipse version

Eclipse Java EE IDE for Web Developers.

Version: Helios Release
Build id: 20100617-1415

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