EDIT: Inside /etc/apt/sources.list.d/ I have: When I do apt-get update I get an error, I don't know if it is important: It looks like you didn't run sudo apt-get update. cat >/etc/apt/sources.list <about->Software&Update reload sudoapt-get update 2.2 ubuntuhttpdroot@ubuntu:~# apt-get install httpdReading, apt-get install libcurl libcurl-develapt-get install perl-ExtUtils-MakeMaker, E: Unable to locate package docker-engine. Reading, cat >/etc/apt/sources.list <