Install Mplayer in Ubuntu Hardy Heron
You need to add the following lines to /etc/apt/sources.list file or you need to make sure you have enabled Universe and multiverse repositories in /etc/apt/sources.list file
sudo gedit /etc/apt/sources.list
Make sure you have the following two lines save and exit your file
deb http://archive.ubuntu.com/ubuntu hardy universe multiverse
deb-src http://archive.ubuntu.com/ubuntu hardy universe multiverse
Now you need to run the following command to update the source list
sudo apt-get update
Install mplayer using the following command
sudo apt-get install mplayer
if you want to open mplayer just type
gmplayer
or
You can Open from Applications—>Sound&Video—> Mplayer Movie Player
Install libdvdcss2 and w32 video codecs in Ubuntu 8.04 (Hardy Heron)
Support for WMV, RealMedia and other formats has been bundled into the w32codecs package. This package is not available from the Ubuntu repositories due to licensing and legal restrictions.
For Ubuntu 8.04 (Hardy Heron) Users run the following command
sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list
Then, add the GPG Key using the following commands
sudo apt-get update
sudo apt-get install medibuntu-keyring
sudo apt-get update
For i386 Users install Codecs using the following command
sudo apt-get install w32codecs libdvdcss2
For amd64 Users install Codecs using the following command
sudo apt-get install w64codecs libdvdcss2
Using above download locations you can install most of the mutimedia codecs for ubuntu.
Mplayer Plugin for Firefox
If you want to install Mplayer with plug-in for Mozilla Firefox run the following command
sudo apt-get install mozilla-mplayer