title: Unable to establish one or more of the specified browser connections / Ubuntu / Firefox Headless
body: <p>My setup:</p>
  <p>OS: Ubuntu 18</p>
  <p>Testcafe Version: 1.8.8</p>
  <p>Browser: Firefox</p>
  <p>I have several Ubuntu servers where Testcafe was working. Due to a security issue, I had to reinstall the servers entirely. Unfortunately in the fresh reinstall, Testcafe is saying it is unable to establish one or more of the specified browser connections.  I have firefox installed and reconfirmed it was installed.</p>
  <p>Previously I did this:</p>
  <ol>
  <li>Issue command: <code>sudo testcafe test.js</code></li>
  <li>Expected behavior: After a moment, I could visibly see in the logs that the test was running using Firefox headless.  <em>Life was fine</em>.</li>
  </ol>
  <p>Now when I do the exact same thing in the fresh reinstall:</p>
  <ol>
  <li>Issue command: <code>sudo testcafe test.js</code></li>
  <li>Unexpected behavior: After a moment, I get this in console:</li>
  </ol>
  <p><code>Using locally installed version of TestCafe. ERROR Unable to establish one or more of the specified browser connections. This can be caused by network issues or remote device failure.</code></p>
  <p><em>Bummer!</em></p>
  <p>Here is the .testcaferc.json I am using:</p>
  <pre><code>{
      &quot;browsers&quot;: [&quot;firefox:headless&quot;],
          &quot;speed&quot;: 0.1,
          &quot;skipJsErrors&quot; : true,
          &quot;pageLoadTimeout&quot;: 5000
  }
  </code></pre>
  <p>When I run <code>testcafe --list-browsers</code>, I get:
  <code>firefox</code></p>
  <p>My test file:</p>
  <pre><code>import { ClientFunction, Selector } from 'testcafe';
  
  fixture `triage`
      .page('https://www.google.com/');
  
  test(`test debugging`, async t =&gt; {
  
  await t
      .wait(5000)
          console.log(`I did it!`)
  
  })
  </code></pre>
  <p>Previously there was no issue!  Had I not had to reinstall Ubuntu, there would be no fail. I have actually 5 servers like this and really need a fix. Any ideas why this is happening?</p>
  <p>I even installed chrome. Same issue! Failure to establish a connection to chrome too.</p>