root@michael:/usr/local/games# sh true.combat.elite_0.49b-english-3.run
Verifying archive integrity... All good.
Uncompressing True Combat: Elite 0.49b-english-3 Installer...............................
Searching Return to Castle Wolfenstein: Enemy Territory....
dirname: missing operand
Try `dirname --help' for more information.
md5sum: /et.x86: No such file or directory
Return to Castle Wolfenstein: Enemy Territory found in /
[: 65: e612c922bec7d8f4d7a8dfbbea3dade3: unexpected operator
Installing in /
Seems like Return to Castle Wolfenstein: Enemy Territory was installed by another user.
You have to install True Combat: Elite as the same user who did install Return to Castle Wolfenstein: Enemy Territory.