Hi, My name is Blake, and I'm a postdoc at the U. of Arizona. I'm starting to use Chimera after using Pymol for a long time, but have had trouble getting it installed. After downloading the .exe file and changing it to an executable, here is the error message I get: blake@omega:~/Desktop$ ls -l chimera-1.2540-linux.exe -rwxr-xr-x 1 blake blake 97898302 2008-09-10 14:12 chimera-1.2540-linux.exe blake@omega:~/Desktop$ sudo ./chimera-1.2540-linux.exe [sudo] password for blake: sudo: unable to execute ./chimera-1.2540-linux.exe: No such file or directory There has to be something obvious I'm missing here, correct? I'm running Ubuntu v. 8.04, if that helps. Thanks, and talk to you soon. Blake -- Research Assistant Department of Chemistry University of Arizona "Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something and that this thing must be attained." Marie Curie