Enemy territory Sous Linux

Bonjour, voice mon message d'erreur , christopher@christopher-desktop:~$ sudo -s
[sudo] password for christopher:
root@christopher-desktop:~# /home/christopher/et-linux-2.55.x86.run
Verifying archive integrity... All good.
Uncompressing Enemy Territory 2.55...........................................................................................................................................................................................................................................................................................................
/home/christopher/.setup12408: error while loading shared libraries: libgtk-1.2.so.0: cannot open shared object file: No such file or directory
The setup program seems to have failed on x86/glibc-2.1

See http://zerowing.idsoftware.com/linux/ for troubleshooting
root@christopher-desktop:~#
root@christopher-desktop:~#
quel est le problem ???