title: Docker not able to communicate with internet (docker0 bridge linkdown)
body: <p>I was trying to run below command for testing docker connectivity to INTERNET.</p>
  
  <pre><code>docker run appropriate/curl https://google.com
  </code></pre>
  
  <p>It doesn't work and says cannot resolve the host. Then I checked the docker0 bridge which is used in this process.</p>
  
  <pre><code>xxxx-yy$ ip route
  default via 10.0.2.2 dev enp0s3  proto static  metric 100 
  10.0.2.0/24 dev enp0s3  proto kernel  scope link  src 10.0.2.15  metric 100 
  169.254.0.0/16 dev enp0s3  scope link  metric 1000 
  172.26.0.0/16 dev docker0  proto kernel  scope link  src 172.26.0.1 linkdown
  </code></pre>
  
  <p>I also checked in another system where it was working fine and there was no "linkdown".
  Could anyone help as why in my system the docker0 status is down (linkdown). I have restarted then reinstalled the docker but with no success.
  I also changed the IP range from default to this new one.</p>
  
  <p>The docker is running on a <strong>Ubuntu virtualbox</strong>.</p>