root@scott-desktop:~/Desktop# ./et-linux-2.55.x86.run
Verifying archive integrity... All good.
Uncompressing Enemy Territory 2.55...........................................................................................................................................................................................................................................................................................................
/home/scott/.setup14043: 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