the gid program on the files: gid10.2.1d-linux-x64-Install gid10.2.1d-linux-x64.tar.gz was compiled on an Ubuntu 10.04.04 LTS system, with gcc 4.4.3. If you can not start GiD with a message complainig about libc.so or glibc_XXX then try the following package: gid10.2.1d-older-linux-x64.tar.gz this GiD in this package was compiled on an Ubuntu 8.04.04 LTS, with gcc 4.2.4 and should work. If it still does not work, please, can you send us a mail to gid@cimne.upc.edu ? thanks for your patience, the gid team