I have 64 bit core i5 configuration I have installed ubuntu studio 11.04 (32 bit) on it.It's working fine but for eclipse android development it is not working what should I do? Should I download 64 bit eclipse or first I do have 64 bit studio OS and then install the rest development environment
No. You can install 32-bit software on an x64 bit machine but you can not install x64 based software on a 32-bit machine.
This rule applies to all Operating Systems.