This bug was fixed in the package adwaita-icon-theme - 3.18.0-2ubuntu3
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adwaita-icon-theme (3.18.0-2ubuntu3) xenial; urgency=medium
* Add B/R, which I thought it had already. (LP: #1540921)
-- Iain Lane Tue, 02 Feb 2016 13:59:39
+
** Changed
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: adwaita-icon-theme (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1540921