Hi Ojha, Your problem installing 64-bit Linux Chimera 1.2422 is that system library glibc 2.4 is not found. I wonder whether your Linux distribution is too old to have this library or too new. Can you tell me what linux distribution you are using? The glibc 2.4 library first came out in March 2006. glibc 2.5 appeared in September 2006, and glibc 2.6 appeared in April 2007. We only have one 64-bit linux system to build Chimera distributions on, and it uses glibc 2.4. You can try the 32-bit linux version of Chimera. I believe it will work with older linux (including 64-bit) distributions. This problem was reported earlier (June 2007) and is in the Chimera bug database, id 3987. http://www.cgl.ucsf.edu/cgi-bin/gnatsweb.pl?cmd=view&pr=3987&database=chimer... Tom