This bug was fixed in the package horizon - 3:12.0.0-0ubuntu2
--------------- horizon (3:12.0.0-0ubuntu2) artful; urgency=medium
* debian/theme/ubuntu/_styles.scss: Ensure btn-primary text color takes precedence (LP: #1481216).
-- Corey Bryant <email address hidden> Fri, 22 Sep 2017 10:23:14 -0400
This bug was fixed in the package horizon - 3:12.0.0-0ubuntu2
---------------
horizon (3:12.0.0-0ubuntu2) artful; urgency=medium
* debian/ theme/ubuntu/ _styles. scss: Ensure btn-primary text color takes
precedence (LP: #1481216).
-- Corey Bryant <email address hidden> Fri, 22 Sep 2017 10:23:14 -0400