WORKAROUND (for 16.04):
Reinstall the original theme, from before the regression occurred:
1. wget https://launchpad.net/ubuntu/+archive/primary/+files/light-themes_14.04+16.04.20160415-0ubuntu1_all.deb 2. sudo dpkg -i light-themes_14.04+16.04.20160415-0ubuntu1_all.deb
WORKAROUND (for 16.04):
Reinstall the original theme, from before the regression occurred:
1. wget https:/ /launchpad. net/ubuntu/ +archive/ primary/ +files/ light-themes_ 14.04+16. 04.20160415- 0ubuntu1_ all.deb 14.04+16. 04.20160415- 0ubuntu1_ all.deb
2. sudo dpkg -i light-themes_