I want to use some programs (CORSIKA/FLUKA) which are essentially designed for 32 bit systems. so I installed Ubuntu 12.04 32 bit on my system (Intel® Core™ i7-2700K CPU @ 3.50GHz × 8). Before this I had installed Ubuntu 9.10 (32-bit) on an older system and installed g77 from hardy repositories, compiled those programs without any problem. But this time when changing the repositories, g77 could not be installed even i removed all the things that i thought make this installation impossible, for example I need gcc-3.4 and removed all newer versions and tried to install them from hardy repositories. but the problem is that, whenever I have g77, corsika does not compile, and whenever I remove it, fluka does not compile, and also i received a error messages like this: crt1.o not found in /usr/bin/lb. In fact these .o files does not exist on my system user/bin/lb I have no directory lb there? I do not know how to link it? Or do i need to reinstall everything?