Hi, just reporting a problem, I tried to run julia on Ubuntu 13.04 on a free EC2 instance (t1.micro) and got an Illegal instruction just after typing julia. I tried both 32 and 64 bit Ubuntu. Haven't tried this on a non-free instance. Steps to reproduce: - create a t1.micro instance running the OS : Ubuntu server 13.04 (32 or 64 bits) ; - sudo apt-get install julia - execute 'julia' - "Illegal instruction (core dumped)"