На счет VLC
http://www.videolan.org/vlc/download-ubuntu.html===============================================================================
Graphical way
Open Synaptic application
Click on System -> Administration -> Synaptic Package Manager.
In Settings -> Repositories, make sure you have an universe repository activated.
Search for vlc and install it. You should install vlc-plugin-pulse and mozilla-plugin-vlc as well.
If you are interested in streaming or transcoding, you should additionnally install libavcodec-extra-52 from a multiverse repository.
================================================================================
Playing DVD (libdvdcss)
In order to be able to play region-locked DVD, you need install libdvdcss2. You can either follow this procedure or add "medibuntu" to your repositories and install libdvdcss2.
================================================================================
От себя добавлю:
если установлены mozilla-plugin-vlc и gecko-mediaplayer то последний не используется (хотя последний намного больше форматов мультимедиа воспроизводит)
то есть mozilla-plugin-vlc я бы не стал ставить