I am trying to install emonCMS and get the following error Package php5 has no installation candidate. list Find the 3 lines that match the below lines in that file (the red text might differ depending upon your Ubuntu version) deb trusty main deb trusty-updates main deb trusty-security main and append multiverse to the end of them: deb trusty main multiverse deb trusty-updates main multiverse deb trusty-security main multiverse Do not delete any other words at the end of the lines like main or universe.