Inline styling font-family not working on gmail and outlook

I have create a template and have use a google font family 'Ubuntu' as follow:. However when viewing on gmail or outlook, it is display the text in Arial. Can anyone help me on this. Thanks you.

<td align="center" style="color: #fff;font-size: 29px;padding: 30px 0 15px 0;font-weight:500;font-family:'Ubuntu', sans-serif;">Text</td>

In the head, I have added the link to call the font as follow:

<link href="http://ift.tt/28Z0zpG" rel="stylesheet">