title: apt-get update fails to to fetch repositories
body: <p>Trying to install packages on the new computer I got from Logic Supply.</p>
  
  <p>When I first got it and logged in to install new packages, I did <code>apt-get update</code> and got (simplified):</p>
  
  <pre><code>Err:1 http://us.archive.ubuntu.com/ubuntu/ xenial InRelease
     Could not resolve 'usvt-livepaapt01.logicsupply.com'
  Err:2 ...
  Err:3 ...
  Reading package lists... Done
  W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/xenial/InRelease Could not resolve 'usvt-livepaapt01.logicsupply.com'
  W: ...
  W: ...
  W: Some files failed to download. They have been ignored, or old ones used instead
  </code></pre>
  
  <p>which is one problem, but the more serious one is that if I do (for example):</p>
  
  <p>sudo apt-get install make</p>
  
  <p>I get:</p>
  
  <pre><code>...
  Package wget is not available, but is referred to by another package
  This may mean that the package is missing, has been obsolete, or is only available from another source
  
  E: Package 'wget' has no installation candidate
  </code></pre>
  
  <p>I complained to Logic Supply, and they told me to just delete</p>
  
  <pre><code>/etc/modprobe.d/blacklist.local.conf
  </code></pre>
  
  <p>and reboot, which I did. But it didn't solve it.</p>
  
  <p>I have deleted <code>/var/lib/apt/lists/*</code> and <code>/etc/apt/sources.list.d</code>.</p>
  
  <p>Everything I can find on the web is on fixing the network, but my network seems ok. I can ping the <code>us.archive.ubuntu.com</code> servers.</p>
  
  <p>The content of my <code>/etc/apt/sources.list</code> is:</p>
  
  <pre><code>###### Ubuntu Main Repos
  deb http://us.archive.ubuntu.com/ubuntu/ xenial main 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 
  
  ###### Ubuntu Update Repos 
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-security main 
  deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
  </code></pre>
  
  <p>Any ideas? How do I reset apt-get not to try to resolve from the logicsupply.com server?</p>