Hi,Thanks for the reply. I am running guix-daemon with --non-substitute option. And the error posted actually complains about Error 404. I am not sure, if it is happening because of firewall. Although, I tried the suggested method also but result is still the same. I cleaned up the store with "guix gc" and restarted for scratch. Additionally, I am unable to understand why "linux-libre" is required to install a hello program?Thanks,RohitOn Sun, Feb 5, 2017 at 5:29 AM, ng0 <contact.ng0@cryptolab.net> wrote:guix package --fallback --install hello