Apparently bug is open for more than 3 months <a href="https:&#x2F;&#x2F;bugs.launchpad.net&#x2F;ubuntu&#x2F;+source&#x2F;gtk3-engines-unico&#x2F;+bug&#x2F;1458135" rel="nofollow">https:&#x2F;&#x2F;bugs.launchpad.net&#x2F;ubuntu&#x2F;+source&#x2F;gtk3-engines-unico...</a>