Trisquel linux is a gnu/linux distro based on ubuntu 9.04 supports multimedia and youtube out of the box and is approved by Free Software Foundation which does not uses any proprietary softwares
Trisquel GNU/Linux is a version of the GNU operating system using the Linux kernel. The main goals of the project are the production of a fully free as in speech system that must be easy to use, complete, and with good language support including translations for the English (default), Basque, Catalonian, Chinese, French, Galician, Hindi, Portuguese and Spanish languages.
Trisquel's name comes from the Celtic symbol triskelion, or triskele in English, consisting of three interlocked spirals. The project's logo depicts a triskelion made of the union of three Debian swirls as a sign of recognition to the project on which it is based.
The project was born in 2004 with the sponsorship of the University of Vigo, and officially presented in April 2005 with Richard Stallman, founder of the GNU project, as a special guest. It was originally developed as a Debian-based distribution, but the repositories were changed to Ubuntu with the 2.0 release, in the summer of 2008. The project hosts its own repositories which are derivatives of Ubuntu's main and universe components, but with all proprietary software removed. The differences include the removal of all non-free packages, the substitution of the original Linux kernel with the blob-free version linux-libre, and the addition of several packages.
By December 11, 2008, Trisquel GNU/Linux was included by the Free Software Foundation in the list of free GNU/Linux distributions  available at the GNU webpage, following the verification process taken to ensure the commitment of the Trisquel development team and community to promoting and distributing only 100% free software.