No internet ... problems : Easy to get the binary package ..
http://packages.ubuntu.com/karmic/graphics/mplayer
But then you also need to download the 40 ? dependencies,
( and their dependencies, if any.)
Example Ubuntu 9.10 Karmic : I only need fourteen of those,
for my "Karmic". ( Total 30 MB to be installed, when checking
with : sudo apt-get install mplayer .)
Better check, what you already have .. against the list
with the read dots ( in the link.)
Making a list of already installed packages :
dpkg --get-selections > selections.txt
or dpkg --get-selections \* > selections.txt
A list ordered with install time, the latest at line 1 :
ls -tl /var/lib/dpkg/info/ | grep list > installed-packages.txt
.....