On running ‘apache50 start’ command on CS50 IDE, the terminal prompts for '[sudo] password for ubuntu : ', though I can like before use sudo command. This was working perfectly fine before. I have restarted the IDE, reloaded the page couple of times still the problem persists.
Sorry for that! Should be fixed asap! See http://cs50.stackexchange.com/questions/22486/ubuntu-password-required-when-starting-apache-50-pset7 for temporary fixes!