As I red on http://www.shicho.net/lamp/?p=88 (thanks to Lamp):

Code:
I went to:

* https://launchpad.net/ubuntu/hardy/i386/libglib1.2ldbl/1.2.10-19build1

Downloaded and installed:

    * libglib1.2ldbl_1.2.10-19build1_i386.deb

Went to:

* https://launchpad.net/ubuntu/+source/gtk+1.2/1.2.10-18.1build2/+build/484191

Downloaded and installed (in this order):

    * libgtk1.2-common_1.2.10-18.1build2_all.deb
    * libgtk1.2_1.2.10-18.1build2_i386.deb

Went to:

* https://launchpad.net/ubuntu/hardy/i386/xmms/1:1.2.10+20070601-1build2

Downloaded and installed:

    * xmms_1.2.10+20070601-1build2_i386.deb

Amazingly, this seemed to work!
Hope it can help other users!

Why use XMMS instead of XMMS2 or other software? Because they simply doesn't work, or use too much memory or cpu, or they are not so intuitive to use.

Really I can't understand why not supporting xmms into Ubuntu; I know that is not supported anymore but there are MILLIONS of people still using it in the world; a query on google will show this. Also, eliminating the old GLIB 1.2.2 is a very bad thing.