Works fine for me in Ubuntu 14.04 with Unity as my Desktop environment and using the latest packaged version of Chromium.<p>It only comes up if you receive a notification from a website: <a href="http:&#x2F;&#x2F;imgur.com&#x2F;lGOJrHb" rel="nofollow">http:&#x2F;&#x2F;imgur.com&#x2F;lGOJrHb</a><p>You can then click &#x27;Chromium - Notifications&#x27; to get what I believe to be the &#x27;notification center&#x27;: <a href="http:&#x2F;&#x2F;imgur.com&#x2F;JyIVNvG" rel="nofollow">http:&#x2F;&#x2F;imgur.com&#x2F;JyIVNvG</a><p>you can try it out if you open the chromium console (f12), and enter &quot;setTimeout(() =&gt; new Notification(&quot;Insert text here&quot;), 2000)&quot; and alt-tab to something that isn&#x27;t chromium.<p>Neat feature, but hard to expect users to figure it out on their own.