René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Dependency install issues","articleBody":"`Reading package lists... Done\r\nBuilding dependency tree\r\nReading state information... Done\r\nPackage xvfb is not available, but is referred to by another package.\r\nThis may mean that the package is missing, has been obsoleted, or\r\nis only available from another source\r\n\r\nE: Unable to locate package swig\r\nE: Unable to locate package swig3.0\r\nE: Couldn't find any package by glob 'swig3.0'\r\nE: Couldn't find any package by regex 'swig3.0'\r\nE: Unable to locate package libssl-dev\r\nE: Unable to locate package libjpeg-dev\r\nE: Package 'xvfb' has no installation candidate`\r\n\r\nI get this when I run ./install-dependencies.sh \r\nAny clue what could be causing me to miss locating those packages. I seem to be unable to apt-get them or pip them too...\r\nThanks!","author":{"url":"https://github.com/JMWatkins","@type":"Person","name":"JMWatkins"},"datePublished":"2017-04-27T13:06:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/25/httpscreenshot/issues/25"}